diff --git a/Controllers/AuthController.cs b/Controllers/AuthController.cs
index 888e7b3..a9ed83a 100644
--- a/Controllers/AuthController.cs
+++ b/Controllers/AuthController.cs
@@ -1,9 +1,10 @@
 using System.IdentityModel.Tokens.Jwt;
 using System.Security.Claims;
 using System.Text;
-using line_gestao_api.Data;
 using line_gestao_api.Dtos;
 using line_gestao_api.Models;
+using line_gestao_api.Services;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
@@ -15,80 +16,101 @@ namespace line_gestao_api.Controllers;
 [Route("auth")]
 public class AuthController : ControllerBase
 {
-    private readonly AppDbContext _db;
+    private readonly UserManager<ApplicationUser> _userManager;
+    private readonly ITenantProvider _tenantProvider;
     private readonly IConfiguration _config;
 
-    public AuthController(AppDbContext db, IConfiguration config)
+    public AuthController(UserManager<ApplicationUser> userManager, ITenantProvider tenantProvider, IConfiguration config)
     {
-        _db = db;
+        _userManager = userManager;
+        _tenantProvider = tenantProvider;
         _config = config;
     }
 
     [HttpPost("register")]
+    [Authorize(Roles = "admin")]
     public async Task<IActionResult> Register(RegisterRequest req)
     {
-        // ✅ NOVO: valida confirmação de senha (não vai pro banco, só valida)
         if (req.Password != req.ConfirmPassword)
             return BadRequest("As senhas não conferem.");
 
-        var email = req.Email.Trim().ToLower();
+        var tenantId = _tenantProvider.TenantId;
+        if (tenantId == null)
+        {
+            return Unauthorized("Tenant inválido.");
+        }
 
-        var exists = await _db.Users.AnyAsync(u => u.Email.ToLower() == email);
+        var email = req.Email.Trim().ToLowerInvariant();
+        var normalizedEmail = _userManager.NormalizeEmail(email);
+
+        var exists = await _userManager.Users.AnyAsync(u => u.NormalizedEmail == normalizedEmail && u.TenantId == tenantId);
         if (exists) return BadRequest("E-mail já cadastrado.");
 
-        // ✅ NOVO: normaliza telefone (salva somente dígitos)
-        var phoneDigits = new string((req.Phone ?? string.Empty).Where(char.IsDigit).ToArray());
-
-        var user = new User
+        var user = new ApplicationUser
         {
             Name = req.Name.Trim(),
             Email = email,
-            Phone = phoneDigits // ✅ NOVO
+            UserName = email,
+            TenantId = tenantId.Value,
+            IsActive = true,
+            EmailConfirmed = true
         };
 
-        var hasher = new PasswordHasher<User>();
-        user.PasswordHash = hasher.HashPassword(user, req.Password);
+        var createResult = await _userManager.CreateAsync(user, req.Password);
+        if (!createResult.Succeeded)
+        {
+            return BadRequest(createResult.Errors.Select(e => e.Description).ToList());
+        }
 
-        _db.Users.Add(user);
-        await _db.SaveChangesAsync();
+        await _userManager.AddToRoleAsync(user, "leitura");
 
-        var token = GenerateJwt(user);
+        var token = await GenerateJwtAsync(user);
         return Ok(new AuthResponse(token));
     }
 
     [HttpPost("login")]
     public async Task<IActionResult> Login(LoginRequest req)
     {
-        var email = req.Email.Trim().ToLower();
+        var email = req.Email.Trim().ToLowerInvariant();
+        var normalizedEmail = _userManager.NormalizeEmail(email);
 
-        var user = await _db.Users.FirstOrDefaultAsync(u => u.Email.ToLower() == email);
-        if (user is null) return Unauthorized("Credenciais inválidas.");
+        var users = await _userManager.Users
+            .Where(u => u.NormalizedEmail == normalizedEmail)
+            .ToListAsync();
 
-        var hasher = new PasswordHasher<User>();
-        var result = hasher.VerifyHashedPassword(user, user.PasswordHash, req.Password);
-
-        if (result == PasswordVerificationResult.Failed)
+        if (users.Count != 1)
             return Unauthorized("Credenciais inválidas.");
 
-        var token = GenerateJwt(user);
+        var user = users[0];
+        if (!user.IsActive)
+            return Unauthorized("Usuário desativado.");
+
+        var valid = await _userManager.CheckPasswordAsync(user, req.Password);
+        if (!valid)
+            return Unauthorized("Credenciais inválidas.");
+
+        var token = await GenerateJwtAsync(user);
         return Ok(new AuthResponse(token));
     }
 
-    private string GenerateJwt(User user)
+    private async Task<string> GenerateJwtAsync(ApplicationUser user)
     {
         var key = _config["Jwt:Key"]!;
         var issuer = _config["Jwt:Issuer"]!;
         var audience = _config["Jwt:Audience"]!;
         var expiresMinutes = int.Parse(_config["Jwt:ExpiresMinutes"]!);
 
+        var roles = await _userManager.GetRolesAsync(user);
         var claims = new List<Claim>
         {
             new(JwtRegisteredClaimNames.Sub, user.Id.ToString()),
-            new(JwtRegisteredClaimNames.Email, user.Email),
+            new(JwtRegisteredClaimNames.Email, user.Email ?? string.Empty),
             new("name", user.Name),
-            new("phone", user.Phone ?? string.Empty) // ✅ NOVO (opcional, mas útil)
+            new("tenantId", user.TenantId.ToString())
         };
 
+        claims.AddRange(roles.Select(r => new Claim(ClaimTypes.Role, r)));
+
         var signingKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));
         var creds = new SigningCredentials(signingKey, SecurityAlgorithms.HmacSha256);
 
diff --git a/Controllers/UsersController.cs b/Controllers/UsersController.cs
new file mode 100644
index 0000000..ee908e2
--- /dev/null
+++ b/Controllers/UsersController.cs
@@ -0,0 +1,283 @@
+using line_gestao_api.Data;
+using line_gestao_api.Dtos;
+using line_gestao_api.Models;
+using line_gestao_api.Services;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace line_gestao_api.Controllers;
+
+[ApiController]
+[Route("api/users")]
+[Authorize]
+public class UsersController : ControllerBase
+{
+    private readonly AppDbContext _db;
+    private readonly UserManager<ApplicationUser> _userManager;
+    private readonly RoleManager<IdentityRole<Guid>> _roleManager;
+    private readonly ITenantProvider _tenantProvider;
+
+    public UsersController(
+        AppDbContext db,
+        UserManager<ApplicationUser> userManager,
+        RoleManager<IdentityRole<Guid>> roleManager,
+        ITenantProvider tenantProvider)
+    {
+        _db = db;
+        _userManager = userManager;
+        _roleManager = roleManager;
+        _tenantProvider = tenantProvider;
+    }
+
+    [HttpPost]
+    [Authorize(Roles = "admin")]
+    public async Task<ActionResult<UserListItemDto>> Create([FromBody] UserCreateRequest req)
+    {
+        var errors = ValidateCreate(req);
+        if (errors.Count > 0)
+        {
+            return BadRequest(new ValidationErrorResponse { Errors = errors });
+        }
+
+        if (_tenantProvider.TenantId == null)
+        {
+            return Unauthorized();
+        }
+
+        var tenantId = _tenantProvider.TenantId.Value;
+        var email = req.Email.Trim().ToLowerInvariant();
+        var normalizedEmail = _userManager.NormalizeEmail(email);
+
+        var exists = await _userManager.Users
+            .AnyAsync(u => u.TenantId == tenantId && u.NormalizedEmail == normalizedEmail);
+
+        if (exists)
+        {
+            return BadRequest(new ValidationErrorResponse
+            {
+                Errors = new List<ValidationErrorDto>
+                {
+                    new() { Field = "email", Message = "E-mail já cadastrado." }
+                }
+            });
+        }
+
+        var role = req.Permissao.Trim().ToLowerInvariant();
+        if (!await _roleManager.RoleExistsAsync(role))
+        {
+            return BadRequest(new ValidationErrorResponse
+            {
+                Errors = new List<ValidationErrorDto>
+                {
+                    new() { Field = "permissao", Message = "Permissão inválida." }
+                }
+            });
+        }
+
+        var user = new ApplicationUser
+        {
+            Name = req.Nome.Trim(),
+            Email = email,
+            UserName = email,
+            TenantId = tenantId,
+            IsActive = true,
+            EmailConfirmed = true
+        };
+
+        var createResult = await _userManager.CreateAsync(user, req.Senha);
+        if (!createResult.Succeeded)
+        {
+            return BadRequest(new ValidationErrorResponse
+            {
+                Errors = createResult.Errors.Select(e => new ValidationErrorDto
+                {
+                    Field = "senha",
+                    Message = e.Description
+                }).ToList()
+            });
+        }
+
+        await _userManager.AddToRoleAsync(user, role);
+
+        var response = new UserListItemDto
+        {
+            Id = user.Id,
+            Nome = user.Name,
+            Email = user.Email ?? string.Empty,
+            Permissao = role,
+            TenantId = user.TenantId,
+            Ativo = user.IsActive
+        };
+
+        return CreatedAtAction(nameof(GetById), new { id = user.Id }, response);
+    }
+
+    [HttpGet]
+    [Authorize(Roles = "admin")]
+    public async Task<ActionResult<PagedResult<UserListItemDto>>> GetAll(
+        [FromQuery] string? search,
+        [FromQuery] string? permissao,
+        [FromQuery] int page = 1,
+        [FromQuery] int pageSize = 20)
+    {
+        page = page < 1 ? 1 : page;
+        pageSize = pageSize < 1 ? 20 : pageSize;
+
+        var usersQuery = _userManager.Users.AsNoTracking();
+
+        if (!string.IsNullOrWhiteSpace(search))
+        {
+            var term = search.Trim();
+            usersQuery = usersQuery.Where(u =>
+                EF.Functions.ILike(u.Name, $"%{term}%") ||
+                EF.Functions.ILike(u.Email ?? string.Empty, $"%{term}%"));
+        }
+
+        IQueryable<Guid> userIdsByRole = Enumerable.Empty<Guid>().AsQueryable();
+        if (!string.IsNullOrWhiteSpace(permissao))
+        {
+            var roleName = permissao.Trim().ToLowerInvariant();
+            userIdsByRole = from ur in _db.UserRoles
+                            join r in _db.Roles on ur.RoleId equals r.Id
+                            where r.Name == roleName
+                            select ur.UserId;
+            usersQuery = usersQuery.Where(u => userIdsByRole.Contains(u.Id));
+        }
+
+        var total = await usersQuery.CountAsync();
+
+        var users = await usersQuery
+            .OrderBy(u => u.Name)
+            .Skip((page - 1) * pageSize)
+            .Take(pageSize)
+            .ToListAsync();
+
+        var roleLookup = await (from ur in _db.UserRoles
+                                join r in _db.Roles on ur.RoleId equals r.Id
+                                where users.Select(u => u.Id).Contains(ur.UserId)
+                                select new { ur.UserId, Role = r.Name ?? "" })
+            .ToListAsync();
+
+        var roleMap = roleLookup
+            .GroupBy(x => x.UserId)
+            .ToDictionary(g => g.Key, g => g.First().Role);
+
+        var items = users.Select(u => new UserListItemDto
+        {
+            Id = u.Id,
+            Nome = u.Name,
+            Email = u.Email ?? string.Empty,
+            Permissao = roleMap.GetValueOrDefault(u.Id, string.Empty),
+            TenantId = u.TenantId,
+            Ativo = u.IsActive
+        }).ToList();
+
+        return Ok(new PagedResult<UserListItemDto>
+        {
+            Page = page,
+            PageSize = pageSize,
+            Total = total,
+            Items = items
+        });
+    }
+
+    [HttpGet("{id:guid}")]
+    [Authorize(Roles = "admin")]
+    public async Task<ActionResult<UserListItemDto>> GetById(Guid id)
+    {
+        var user = await _userManager.Users.AsNoTracking().FirstOrDefaultAsync(u => u.Id == id);
+        if (user == null)
+        {
+            return NotFound();
+        }
+
+        var roles = await _userManager.GetRolesAsync(user);
+        var role = roles.FirstOrDefault() ?? string.Empty;
+
+        return Ok(new UserListItemDto
+        {
+            Id = user.Id,
+            Nome = user.Name,
+            Email = user.Email ?? string.Empty,
+            Permissao = role,
+            TenantId = user.TenantId,
+            Ativo = user.IsActive
+        });
+    }
+
+    [HttpPatch("{id:guid}")]
+    [Authorize(Roles = "admin")]
+    public async Task<IActionResult> Update(Guid id, [FromBody] UserUpdateRequest req)
+    {
+        var user = await _userManager.Users.FirstOrDefaultAsync(u => u.Id == id);
+        if (user == null)
+        {
+            return NotFound();
+        }
+
+        if (req.Ativo.HasValue)
+        {
+            user.IsActive = req.Ativo.Value;
+        }
+
+        if (!string.IsNullOrWhiteSpace(req.Permissao))
+        {
+            var roleName = req.Permissao.Trim().ToLowerInvariant();
+            if (!await _roleManager.RoleExistsAsync(roleName))
+            {
+                return BadRequest(new ValidationErrorResponse
+                {
+                    Errors = new List<ValidationErrorDto>
+                    {
+                        new() { Field = "permissao", Message = "Permissão inválida." }
+                    }
+                });
+            }
+
+            var existingRoles = await _userManager.GetRolesAsync(user);
+            if (existingRoles.Count > 0)
+            {
+                await _userManager.RemoveFromRolesAsync(user, existingRoles);
+            }
+
+            await _userManager.AddToRoleAsync(user, roleName);
+        }
+
+        await _userManager.UpdateAsync(user);
+        return NoContent();
+    }
+
+    private static List<ValidationErrorDto> ValidateCreate(UserCreateRequest req)
+    {
+        var errors = new List<ValidationErrorDto>();
+
+        if (string.IsNullOrWhiteSpace(req.Nome))
+        {
+            errors.Add(new ValidationErrorDto { Field = "nome", Message = "Nome é obrigatório." });
+        }
+
+        if (string.IsNullOrWhiteSpace(req.Email))
+        {
+            errors.Add(new ValidationErrorDto { Field = "email", Message = "Email é obrigatório." });
+        }
+
+        if (string.IsNullOrWhiteSpace(req.Senha) || req.Senha.Length < 6)
+        {
+            errors.Add(new ValidationErrorDto { Field = "senha", Message = "Senha deve ter pelo menos 6 caracteres." });
+        }
+
+        if (req.Senha != req.ConfirmarSenha)
+        {
+            errors.Add(new ValidationErrorDto { Field = "confirmarSenha", Message = "Confirmação de senha inválida." });
+        }
+
+        if (string.IsNullOrWhiteSpace(req.Permissao))
+        {
+            errors.Add(new ValidationErrorDto { Field = "permissao", Message = "Permissão é obrigatória." });
+        }
+
+        return errors;
+    }
+}
diff --git a/Data/AppDbContext.cs b/Data/AppDbContext.cs
index ba6c659..8007767 100644
--- a/Data/AppDbContext.cs
+++ b/Data/AppDbContext.cs
@@ -1,13 +1,21 @@
-using Microsoft.EntityFrameworkCore;
-using line_gestao_api.Models;
+using line_gestao_api.Models;
+using line_gestao_api.Services;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
 
 namespace line_gestao_api.Data;
 
-public class AppDbContext : DbContext
+public class AppDbContext : IdentityDbContext<ApplicationUser, IdentityRole<Guid>, Guid>
 {
-    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options) { }
+    private readonly ITenantProvider _tenantProvider;
 
-    public DbSet<User> Users => Set<User>();
+    public AppDbContext(DbContextOptions<AppDbContext> options, ITenantProvider tenantProvider) : base(options)
+    {
+        _tenantProvider = tenantProvider;
+    }
+
+    public DbSet<Tenant> Tenants => Set<Tenant>();
 
     // ✅ tabela para espelhar a planilha (GERAL)
     public DbSet<MobileLine> MobileLines => Set<MobileLine>();
@@ -35,19 +43,22 @@ public class AppDbContext : DbContext
         base.OnModelCreating(modelBuilder);
 
         // =========================
-        // ✅ USER
+        // ✅ USER (Identity)
         // =========================
-        modelBuilder.Entity<User>()
-            .HasIndex(u => u.Email)
-            .IsUnique();
+        modelBuilder.Entity<ApplicationUser>(e =>
+        {
+            e.Property(x => x.Name).HasMaxLength(120);
+            e.HasIndex(x => new { x.TenantId, x.NormalizedEmail })
+                .IsUnique();
+        });
 
         // =========================
         // ✅ GERAL (MobileLine)
         // =========================
         modelBuilder.Entity<MobileLine>(e =>
         {
-            // Mantém UNIQUE por Linha (se Linha puder ser null no banco, Postgres aceita múltiplos nulls)
-            e.HasIndex(x => x.Linha).IsUnique();
+            // Mantém UNIQUE por Linha por tenant (se Linha puder ser null no banco, Postgres aceita múltiplos nulls)
+            e.HasIndex(x => new { x.TenantId, x.Linha }).IsUnique();
 
             // performance
             e.HasIndex(x => x.Chip);
@@ -66,6 +77,7 @@ public class AppDbContext : DbContext
             e.HasIndex(x => x.ICCID);
             e.HasIndex(x => x.LinhaAntiga);
             e.HasIndex(x => x.LinhaNova);
+            e.HasIndex(x => x.TenantId);
 
             // FK + index
             e.HasIndex(x => x.MobileLineId);
@@ -93,6 +105,7 @@ public class AppDbContext : DbContext
             e.HasIndex(x => x.Cliente);
             e.HasIndex(x => new { x.Tipo, x.Cliente });
             e.HasIndex(x => x.Item);
+            e.HasIndex(x => x.TenantId);
         });
 
         // =========================
@@ -106,6 +119,7 @@ public class AppDbContext : DbContext
             e.HasIndex(x => x.Linha);
             e.HasIndex(x => x.Cpf);
             e.HasIndex(x => x.Email);
+            e.HasIndex(x => x.TenantId);
         });
 
         // =========================
@@ -117,6 +131,7 @@ public class AppDbContext : DbContext
             e.HasIndex(x => x.Cliente);
             e.HasIndex(x => x.Linha);
             e.HasIndex(x => x.DtTerminoFidelizacao);
+            e.HasIndex(x => x.TenantId);
         });
 
         // =========================
@@ -129,6 +144,7 @@ public class AppDbContext : DbContext
             e.HasIndex(x => x.LinhaNova);
             e.HasIndex(x => x.ICCID);
             e.HasIndex(x => x.DataTroca);
+            e.HasIndex(x => x.TenantId);
         });
 
         // =========================
@@ -142,6 +158,7 @@ public class AppDbContext : DbContext
             e.HasIndex(x => x.Lida);
             e.HasIndex(x => x.Data);
             e.HasIndex(x => x.VigenciaLineId);
+            e.HasIndex(x => x.TenantId);
 
             e.HasOne(x => x.User)
                 .WithMany()
@@ -153,5 +170,43 @@ public class AppDbContext : DbContext
                 .HasForeignKey(x => x.VigenciaLineId)
                 .OnDelete(DeleteBehavior.Restrict);
         });
+
+        modelBuilder.Entity<MobileLine>().HasQueryFilter(x => _tenantProvider.TenantId != null && x.TenantId == _tenantProvider.TenantId);
+        modelBuilder.Entity<MuregLine>().HasQueryFilter(x => _tenantProvider.TenantId != null && x.TenantId == _tenantProvider.TenantId);
+        modelBuilder.Entity<BillingClient>().HasQueryFilter(x => _tenantProvider.TenantId != null && x.TenantId == _tenantProvider.TenantId);
+        modelBuilder.Entity<UserData>().HasQueryFilter(x => _tenantProvider.TenantId != null && x.TenantId == _tenantProvider.TenantId);
+        modelBuilder.Entity<VigenciaLine>().HasQueryFilter(x => _tenantProvider.TenantId != null && x.TenantId == _tenantProvider.TenantId);
+        modelBuilder.Entity<TrocaNumeroLine>().HasQueryFilter(x => _tenantProvider.TenantId != null && x.TenantId == _tenantProvider.TenantId);
+        modelBuilder.Entity<Notification>().HasQueryFilter(x => _tenantProvider.TenantId != null && x.TenantId == _tenantProvider.TenantId);
+        modelBuilder.Entity<ApplicationUser>().HasQueryFilter(x => _tenantProvider.TenantId != null && x.TenantId == _tenantProvider.TenantId);
+    }
+
+    public override int SaveChanges()
+    {
+        ApplyTenantIds();
+        return base.SaveChanges();
+    }
+
+    public override Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)
+    {
+        ApplyTenantIds();
+        return base.SaveChangesAsync(cancellationToken);
+    }
+
+    private void ApplyTenantIds()
+    {
+        if (_tenantProvider.TenantId == null)
+        {
+            return;
+        }
+
+        var tenantId = _tenantProvider.TenantId.Value;
+        foreach (var entry in ChangeTracker.Entries<ITenantEntity>().Where(e => e.State == EntityState.Added))
+        {
+            if (entry.Entity.TenantId == Guid.Empty)
+            {
+                entry.Entity.TenantId = tenantId;
+            }
+        }
     }
 }
diff --git a/Data/SeedData.cs b/Data/SeedData.cs
new file mode 100644
index 0000000..fe8108a
--- /dev/null
+++ b/Data/SeedData.cs
@@ -0,0 +1,82 @@
+using line_gestao_api.Models;
+using line_gestao_api.Services;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+
+namespace line_gestao_api.Data;
+
+public class SeedOptions
+{
+    public string DefaultTenantName { get; set; } = "Default";
+    public string AdminName { get; set; } = "Administrador";
+    public string AdminEmail { get; set; } = "admin@linegestao.local";
+    public string AdminPassword { get; set; } = "Admin123!";
+}
+
+public static class SeedData
+{
+    public static readonly Guid DefaultTenantId = Guid.Parse("11111111-1111-1111-1111-111111111111");
+
+    public static async Task EnsureSeedDataAsync(IServiceProvider services)
+    {
+        using var scope = services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+        var userManager = scope.ServiceProvider.GetRequiredService<UserManager<ApplicationUser>>();
+        var roleManager = scope.ServiceProvider.GetRequiredService<RoleManager<IdentityRole<Guid>>>();
+        var tenantProvider = scope.ServiceProvider.GetRequiredService<ITenantProvider>();
+        var options = scope.ServiceProvider.GetRequiredService<IOptions<SeedOptions>>().Value;
+
+        await db.Database.MigrateAsync();
+
+        var roles = new[] { "admin", "gestor", "operador", "leitura" };
+        foreach (var role in roles)
+        {
+            if (!await roleManager.RoleExistsAsync(role))
+            {
+                await roleManager.CreateAsync(new IdentityRole<Guid>(role));
+            }
+        }
+
+        var tenant = await db.Tenants.FirstOrDefaultAsync(t => t.Id == DefaultTenantId);
+        if (tenant == null)
+        {
+            tenant = new Tenant
+            {
+                Id = DefaultTenantId,
+                Name = options.DefaultTenantName,
+                CreatedAt = DateTime.UtcNow
+            };
+
+            db.Tenants.Add(tenant);
+            await db.SaveChangesAsync();
+        }
+
+        tenantProvider.SetTenantId(tenant.Id);
+
+        var normalizedEmail = userManager.NormalizeEmail(options.AdminEmail);
+        var existingAdmin = await userManager.Users
+            .FirstOrDefaultAsync(u => u.NormalizedEmail == normalizedEmail && u.TenantId == tenant.Id);
+
+        if (existingAdmin == null)
+        {
+            var adminUser = new ApplicationUser
+            {
+                UserName = options.AdminEmail,
+                Email = options.AdminEmail,
+                Name = options.AdminName,
+                TenantId = tenant.Id,
+                EmailConfirmed = true,
+                IsActive = true
+            };
+
+            var createResult = await userManager.CreateAsync(adminUser, options.AdminPassword);
+            if (createResult.Succeeded)
+            {
+                await userManager.AddToRoleAsync(adminUser, "admin");
+            }
+        }
+
+        tenantProvider.SetTenantId(null);
+    }
+}
diff --git a/Dtos/UserDtos.cs b/Dtos/UserDtos.cs
new file mode 100644
index 0000000..97edb4d
--- /dev/null
+++ b/Dtos/UserDtos.cs
@@ -0,0 +1,37 @@
+namespace line_gestao_api.Dtos;
+
+public class UserCreateRequest
+{
+    public string Nome { get; set; } = string.Empty;
+    public string Email { get; set; } = string.Empty;
+    public string Senha { get; set; } = string.Empty;
+    public string ConfirmarSenha { get; set; } = string.Empty;
+    public string Permissao { get; set; } = string.Empty;
+}
+
+public class UserUpdateRequest
+{
+    public string? Permissao { get; set; }
+    public bool? Ativo { get; set; }
+}
+
+public class UserListItemDto
+{
+    public Guid Id { get; set; }
+    public string Nome { get; set; } = string.Empty;
+    public string Email { get; set; } = string.Empty;
+    public string Permissao { get; set; } = string.Empty;
+    public Guid TenantId { get; set; }
+    public bool Ativo { get; set; }
+}
+
+public class ValidationErrorDto
+{
+    public string Field { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+}
+
+public class ValidationErrorResponse
+{
+    public List<ValidationErrorDto> Errors { get; set; } = new();
+}
diff --git a/Migrations/20260210120000_AddIdentityAndTenants.Designer.cs b/Migrations/20260210120000_AddIdentityAndTenants.Designer.cs
new file mode 100644
index 0000000..aa581be
--- /dev/null
+++ b/Migrations/20260210120000_AddIdentityAndTenants.Designer.cs
@@ -0,0 +1,837 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using line_gestao_api.Data;
+
+#nullable disable
+
+namespace line_gestao_api.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20260210120000_AddIdentityAndTenants")]
+    partial class AddIdentityAndTenants
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "10.0.1")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("line_gestao_api.Models.ApplicationUser", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<int>("AccessFailedCount")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("ConcurrencyStamp")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Email")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<bool>("EmailConfirmed")
+                        .HasColumnType("boolean");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("boolean");
+
+                    b.Property<DateTimeOffset?>("LockoutEnd")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<bool>("LockoutEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(120)
+                        .HasColumnType("character varying(120)");
+
+                    b.Property<string>("NormalizedEmail")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("NormalizedUserName")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("PasswordHash")
+                        .HasColumnType("text");
+
+                    b.Property<string>("PhoneNumber")
+                        .HasColumnType("text");
+
+                    b.Property<bool>("PhoneNumberConfirmed")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("SecurityStamp")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<bool>("TwoFactorEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("UserName")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NormalizedEmail");
+
+                    b.HasIndex("NormalizedUserName")
+                        .IsUnique();
+
+                    b.HasIndex("TenantId", "NormalizedEmail")
+                        .IsUnique();
+
+                    b.ToTable("AspNetUsers", (string)null);
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.BillingClient", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Aparelho")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Cliente")
+                        .IsRequired()
+                        .HasMaxLength(255)
+                        .HasColumnType("character varying(255)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("FormaPagamento")
+                        .HasColumnType("text");
+
+                    b.Property<decimal?>("FranquiaLine")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("FranquiaVivo")
+                        .HasColumnType("numeric");
+
+                    b.Property<int>("Item")
+                        .HasColumnType("integer");
+
+                    b.Property<decimal?>("Lucro")
+                        .HasColumnType("numeric");
+
+                    b.Property<int?>("QtdLinhas")
+                        .HasColumnType("integer");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Tipo")
+                        .IsRequired()
+                        .HasMaxLength(2)
+                        .HasColumnType("character varying(2)");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<decimal?>("ValorContratoLine")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("ValorContratoVivo")
+                        .HasColumnType("numeric");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Cliente");
+
+                    b.HasIndex("Item");
+
+                    b.HasIndex("TenantId");
+
+                    b.HasIndex("Tipo");
+
+                    b.HasIndex("Tipo", "Cliente");
+
+                    b.ToTable("billing_clients", (string)null);
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.MobileLine", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Cedente")
+                        .HasMaxLength(150)
+                        .HasColumnType("character varying(150)");
+
+                    b.Property<string>("Chip")
+                        .HasMaxLength(40)
+                        .HasColumnType("character varying(40)");
+
+                    b.Property<string>("Cliente")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    b.Property<string>("Conta")
+                        .HasMaxLength(80)
+                        .HasColumnType("character varying(80)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DataBloqueio")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DataEntregaCliente")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DataEntregaOpera")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<decimal?>("Desconto")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("FranquiaGestao")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("FranquiaLine")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("FranquiaVivo")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("GestaoVozDados")
+                        .HasColumnType("numeric");
+
+                    b.Property<int>("Item")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Linha")
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)");
+
+                    b.Property<decimal?>("LocacaoAp")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("Lucro")
+                        .HasColumnType("numeric");
+
+                    b.Property<string>("Modalidade")
+                        .HasMaxLength(80)
+                        .HasColumnType("character varying(80)");
+
+                    b.Property<string>("PlanoContrato")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    b.Property<decimal?>("Skeelo")
+                        .HasColumnType("numeric");
+
+                    b.Property<string>("Skil")
+                        .HasMaxLength(80)
+                        .HasColumnType("character varying(80)");
+
+                    b.Property<string>("Solicitante")
+                        .HasMaxLength(150)
+                        .HasColumnType("character varying(150)");
+
+                    b.Property<string>("Status")
+                        .HasMaxLength(80)
+                        .HasColumnType("character varying(80)");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Usuario")
+                        .HasMaxLength(200)
+                        .HasColumnType("character varying(200)");
+
+                    b.Property<decimal?>("ValorContratoLine")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("ValorContratoVivo")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("ValorPlanoVivo")
+                        .HasColumnType("numeric");
+
+                    b.Property<string>("VencConta")
+                        .HasMaxLength(50)
+                        .HasColumnType("character varying(50)");
+
+                    b.Property<decimal?>("VivoGestaoDispositivo")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("VivoNewsPlus")
+                        .HasColumnType("numeric");
+
+                    b.Property<decimal?>("VivoTravelMundo")
+                        .HasColumnType("numeric");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Chip");
+
+                    b.HasIndex("Cliente");
+
+                    b.HasIndex("Skil");
+
+                    b.HasIndex("Status");
+
+                    b.HasIndex("TenantId", "Linha")
+                        .IsUnique();
+
+                    b.HasIndex("Usuario");
+
+                    b.ToTable("MobileLines");
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.MuregLine", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DataDaMureg")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("ICCID")
+                        .HasMaxLength(40)
+                        .HasColumnType("character varying(40)");
+
+                    b.Property<int>("Item")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("LinhaAntiga")
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)");
+
+                    b.Property<string>("LinhaNova")
+                        .HasMaxLength(30)
+                        .HasColumnType("character varying(30)");
+
+                    b.Property<Guid>("MobileLineId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ICCID");
+
+                    b.HasIndex("Item");
+
+                    b.HasIndex("LinhaAntiga");
+
+                    b.HasIndex("LinhaNova");
+
+                    b.HasIndex("MobileLineId");
+
+                    b.HasIndex("TenantId");
+
+                    b.ToTable("MuregLines");
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.Notification", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Cliente")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("Data")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("DedupKey")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int?>("DiasParaVencer")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Linha")
+                        .HasColumnType("text");
+
+                    b.Property<bool>("Lida")
+                        .HasColumnType("boolean");
+
+                    b.Property<DateTime?>("LidaEm")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Mensagem")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<DateTime?>("ReferenciaData")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Tipo")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("Titulo")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<Guid?>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Usuario")
+                        .HasColumnType("text");
+
+                    b.Property<Guid?>("VigenciaLineId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Cliente");
+
+                    b.HasIndex("Data");
+
+                    b.HasIndex("DedupKey")
+                        .IsUnique();
+
+                    b.HasIndex("Lida");
+
+                    b.HasIndex("TenantId");
+
+                    b.HasIndex("UserId");
+
+                    b.HasIndex("VigenciaLineId");
+
+                    b.ToTable("Notifications");
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.Tenant", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Tenants");
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.TrocaNumeroLine", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DataTroca")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("ICCID")
+                        .HasColumnType("text");
+
+                    b.Property<int>("Item")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("LinhaAntiga")
+                        .HasColumnType("text");
+
+                    b.Property<string>("LinhaNova")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Motivo")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Observacao")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("DataTroca");
+
+                    b.HasIndex("ICCID");
+
+                    b.HasIndex("Item");
+
+                    b.HasIndex("LinhaAntiga");
+
+                    b.HasIndex("LinhaNova");
+
+                    b.HasIndex("TenantId");
+
+                    b.ToTable("TrocaNumeroLines");
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.UserData", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Celular")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Cliente")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Cpf")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DataNascimento")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Email")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Endereco")
+                        .HasColumnType("text");
+
+                    b.Property<int>("Item")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Linha")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Rg")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("TelefoneFixo")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Cliente");
+
+                    b.HasIndex("Cpf");
+
+                    b.HasIndex("Email");
+
+                    b.HasIndex("Item");
+
+                    b.HasIndex("Linha");
+
+                    b.HasIndex("TenantId");
+
+                    b.ToTable("UserDatas");
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.VigenciaLine", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Cliente")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Conta")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DtEfetivacaoServico")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DtTerminoFidelizacao")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int>("Item")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Linha")
+                        .HasColumnType("text");
+
+                    b.Property<string>("PlanoContrato")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<decimal?>("Total")
+                        .HasColumnType("numeric");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Usuario")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Cliente");
+
+                    b.HasIndex("DtTerminoFidelizacao");
+
+                    b.HasIndex("Item");
+
+                    b.HasIndex("Linha");
+
+                    b.HasIndex("TenantId");
+
+                    b.ToTable("VigenciaLines");
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRole<Guid>", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("ConcurrencyStamp")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Name")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("NormalizedName")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NormalizedName")
+                        .IsUnique();
+
+                    b.ToTable("AspNetRoles", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<Guid>", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("ClaimType")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ClaimValue")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("RoleId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("RoleId");
+
+                    b.ToTable("AspNetRoleClaims", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserClaim<Guid>", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("ClaimType")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ClaimValue")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("AspNetUserClaims", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserLogin<Guid>", b =>
+                {
+                    b.Property<string>("LoginProvider")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ProviderKey")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ProviderDisplayName")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("LoginProvider", "ProviderKey");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("AspNetUserLogins", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserRole<Guid>", b =>
+                {
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("RoleId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("UserId", "RoleId");
+
+                    b.HasIndex("RoleId");
+
+                    b.ToTable("AspNetUserRoles", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserToken<Guid>", b =>
+                {
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("LoginProvider")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Value")
+                        .HasColumnType("text");
+
+                    b.HasKey("UserId", "LoginProvider", "Name");
+
+                    b.ToTable("AspNetUserTokens", (string)null);
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.MuregLine", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.MobileLine", "MobileLine")
+                        .WithMany("Muregs")
+                        .HasForeignKey("MobileLineId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("MobileLine");
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.Notification", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", "User")
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.HasOne("line_gestao_api.Models.VigenciaLine", "VigenciaLine")
+                        .WithMany()
+                        .HasForeignKey("VigenciaLineId")
+                        .OnDelete(DeleteBehavior.Restrict);
+
+                    b.Navigation("User");
+
+                    b.Navigation("VigenciaLine");
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<Guid>", b =>
+                {
+                    b.HasOne("Microsoft.AspNetCore.Identity.IdentityRole<Guid>", null)
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserClaim<Guid>", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserLogin<Guid>", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserRole<Guid>", b =>
+                {
+                    b.HasOne("Microsoft.AspNetCore.Identity.IdentityRole<Guid>", null)
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserToken<Guid>", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.MobileLine", b =>
+                {
+                    b.Navigation("Muregs");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/Migrations/20260210120000_AddIdentityAndTenants.cs b/Migrations/20260210120000_AddIdentityAndTenants.cs
new file mode 100644
index 0000000..382545f
--- /dev/null
+++ b/Migrations/20260210120000_AddIdentityAndTenants.cs
@@ -0,0 +1,456 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace line_gestao_api.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddIdentityAndTenants : Migration
+    {
+        private static readonly Guid DefaultTenantId = Guid.Parse("11111111-1111-1111-1111-111111111111");
+
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Notifications_Users_UserId",
+                table: "Notifications");
+
+            migrationBuilder.DropTable(
+                name: "Users");
+
+            migrationBuilder.CreateTable(
+                name: "Tenants",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Name = table.Column<string>(type: "text", nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Tenants", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "AspNetRoles",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Name = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    NormalizedName = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    ConcurrencyStamp = table.Column<string>(type: "text", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_AspNetRoles", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "AspNetUsers",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Name = table.Column<string>(type: "character varying(120)", maxLength: 120, nullable: false),
+                    TenantId = table.Column<Guid>(type: "uuid", nullable: false, defaultValue: DefaultTenantId),
+                    IsActive = table.Column<bool>(type: "boolean", nullable: false, defaultValue: true),
+                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false),
+                    UserName = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    NormalizedUserName = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    Email = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    NormalizedEmail = table.Column<string>(type: "character varying(256)", maxLength: 256, nullable: true),
+                    EmailConfirmed = table.Column<bool>(type: "boolean", nullable: false),
+                    PasswordHash = table.Column<string>(type: "text", nullable: true),
+                    SecurityStamp = table.Column<string>(type: "text", nullable: true),
+                    ConcurrencyStamp = table.Column<string>(type: "text", nullable: true),
+                    PhoneNumber = table.Column<string>(type: "text", nullable: true),
+                    PhoneNumberConfirmed = table.Column<bool>(type: "boolean", nullable: false),
+                    TwoFactorEnabled = table.Column<bool>(type: "boolean", nullable: false),
+                    LockoutEnd = table.Column<DateTimeOffset>(type: "timestamp with time zone", nullable: true),
+                    LockoutEnabled = table.Column<bool>(type: "boolean", nullable: false),
+                    AccessFailedCount = table.Column<int>(type: "integer", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_AspNetUsers", x => x.Id);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "AspNetRoleClaims",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    RoleId = table.Column<Guid>(type: "uuid", nullable: false),
+                    ClaimType = table.Column<string>(type: "text", nullable: true),
+                    ClaimValue = table.Column<string>(type: "text", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_AspNetRoleClaims", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_AspNetRoleClaims_AspNetRoles_RoleId",
+                        column: x => x.RoleId,
+                        principalTable: "AspNetRoles",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "AspNetUserClaims",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    UserId = table.Column<Guid>(type: "uuid", nullable: false),
+                    ClaimType = table.Column<string>(type: "text", nullable: true),
+                    ClaimValue = table.Column<string>(type: "text", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_AspNetUserClaims", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_AspNetUserClaims_AspNetUsers_UserId",
+                        column: x => x.UserId,
+                        principalTable: "AspNetUsers",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "AspNetUserLogins",
+                columns: table => new
+                {
+                    LoginProvider = table.Column<string>(type: "text", nullable: false),
+                    ProviderKey = table.Column<string>(type: "text", nullable: false),
+                    ProviderDisplayName = table.Column<string>(type: "text", nullable: true),
+                    UserId = table.Column<Guid>(type: "uuid", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_AspNetUserLogins", x => new { x.LoginProvider, x.ProviderKey });
+                    table.ForeignKey(
+                        name: "FK_AspNetUserLogins_AspNetUsers_UserId",
+                        column: x => x.UserId,
+                        principalTable: "AspNetUsers",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "AspNetUserRoles",
+                columns: table => new
+                {
+                    UserId = table.Column<Guid>(type: "uuid", nullable: false),
+                    RoleId = table.Column<Guid>(type: "uuid", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_AspNetUserRoles", x => new { x.UserId, x.RoleId });
+                    table.ForeignKey(
+                        name: "FK_AspNetUserRoles_AspNetRoles_RoleId",
+                        column: x => x.RoleId,
+                        principalTable: "AspNetRoles",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_AspNetUserRoles_AspNetUsers_UserId",
+                        column: x => x.UserId,
+                        principalTable: "AspNetUsers",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "AspNetUserTokens",
+                columns: table => new
+                {
+                    UserId = table.Column<Guid>(type: "uuid", nullable: false),
+                    LoginProvider = table.Column<string>(type: "text", nullable: false),
+                    Name = table.Column<string>(type: "text", nullable: false),
+                    Value = table.Column<string>(type: "text", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_AspNetUserTokens", x => new { x.UserId, x.LoginProvider, x.Name });
+                    table.ForeignKey(
+                        name: "FK_AspNetUserTokens_AspNetUsers_UserId",
+                        column: x => x.UserId,
+                        principalTable: "AspNetUsers",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "TenantId",
+                table: "MobileLines",
+                type: "uuid",
+                nullable: false,
+                defaultValue: DefaultTenantId);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "TenantId",
+                table: "MuregLines",
+                type: "uuid",
+                nullable: false,
+                defaultValue: DefaultTenantId);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "TenantId",
+                table: "billing_clients",
+                type: "uuid",
+                nullable: false,
+                defaultValue: DefaultTenantId);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "TenantId",
+                table: "UserDatas",
+                type: "uuid",
+                nullable: false,
+                defaultValue: DefaultTenantId);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "TenantId",
+                table: "VigenciaLines",
+                type: "uuid",
+                nullable: false,
+                defaultValue: DefaultTenantId);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "TenantId",
+                table: "TrocaNumeroLines",
+                type: "uuid",
+                nullable: false,
+                defaultValue: DefaultTenantId);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "TenantId",
+                table: "Notifications",
+                type: "uuid",
+                nullable: false,
+                defaultValue: DefaultTenantId);
+
+            migrationBuilder.DropIndex(
+                name: "IX_MobileLines_Linha",
+                table: "MobileLines");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MobileLines_TenantId_Linha",
+                table: "MobileLines",
+                columns: new[] { "TenantId", "Linha" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MuregLines_TenantId",
+                table: "MuregLines",
+                column: "TenantId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_billing_clients_TenantId",
+                table: "billing_clients",
+                column: "TenantId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_UserDatas_TenantId",
+                table: "UserDatas",
+                column: "TenantId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_VigenciaLines_TenantId",
+                table: "VigenciaLines",
+                column: "TenantId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_TrocaNumeroLines_TenantId",
+                table: "TrocaNumeroLines",
+                column: "TenantId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Notifications_TenantId",
+                table: "Notifications",
+                column: "TenantId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_AspNetRoles_NormalizedName",
+                table: "AspNetRoles",
+                column: "NormalizedName",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_AspNetUsers_NormalizedEmail",
+                table: "AspNetUsers",
+                column: "NormalizedEmail");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_AspNetUsers_NormalizedUserName",
+                table: "AspNetUsers",
+                column: "NormalizedUserName",
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_AspNetUsers_TenantId_NormalizedEmail",
+                table: "AspNetUsers",
+                columns: new[] { "TenantId", "NormalizedEmail" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_AspNetRoleClaims_RoleId",
+                table: "AspNetRoleClaims",
+                column: "RoleId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_AspNetUserClaims_UserId",
+                table: "AspNetUserClaims",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_AspNetUserLogins_UserId",
+                table: "AspNetUserLogins",
+                column: "UserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_AspNetUserRoles_RoleId",
+                table: "AspNetUserRoles",
+                column: "RoleId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Notifications_AspNetUsers_UserId",
+                table: "Notifications",
+                column: "UserId",
+                principalTable: "AspNetUsers",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.InsertData(
+                table: "Tenants",
+                columns: new[] { "Id", "Name", "CreatedAt" },
+                values: new object[] { DefaultTenantId, "Default", DateTime.UtcNow });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Notifications_AspNetUsers_UserId",
+                table: "Notifications");
+
+            migrationBuilder.DropTable(
+                name: "AspNetRoleClaims");
+
+            migrationBuilder.DropTable(
+                name: "AspNetUserClaims");
+
+            migrationBuilder.DropTable(
+                name: "AspNetUserLogins");
+
+            migrationBuilder.DropTable(
+                name: "AspNetUserRoles");
+
+            migrationBuilder.DropTable(
+                name: "AspNetUserTokens");
+
+            migrationBuilder.DropTable(
+                name: "AspNetRoles");
+
+            migrationBuilder.DropTable(
+                name: "AspNetUsers");
+
+            migrationBuilder.DropTable(
+                name: "Tenants");
+
+            migrationBuilder.DropIndex(
+                name: "IX_MobileLines_TenantId_Linha",
+                table: "MobileLines");
+
+            migrationBuilder.DropIndex(
+                name: "IX_MuregLines_TenantId",
+                table: "MuregLines");
+
+            migrationBuilder.DropIndex(
+                name: "IX_billing_clients_TenantId",
+                table: "billing_clients");
+
+            migrationBuilder.DropIndex(
+                name: "IX_UserDatas_TenantId",
+                table: "UserDatas");
+
+            migrationBuilder.DropIndex(
+                name: "IX_VigenciaLines_TenantId",
+                table: "VigenciaLines");
+
+            migrationBuilder.DropIndex(
+                name: "IX_TrocaNumeroLines_TenantId",
+                table: "TrocaNumeroLines");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Notifications_TenantId",
+                table: "Notifications");
+
+            migrationBuilder.DropColumn(
+                name: "TenantId",
+                table: "MobileLines");
+
+            migrationBuilder.DropColumn(
+                name: "TenantId",
+                table: "MuregLines");
+
+            migrationBuilder.DropColumn(
+                name: "TenantId",
+                table: "billing_clients");
+
+            migrationBuilder.DropColumn(
+                name: "TenantId",
+                table: "UserDatas");
+
+            migrationBuilder.DropColumn(
+                name: "TenantId",
+                table: "VigenciaLines");
+
+            migrationBuilder.DropColumn(
+                name: "TenantId",
+                table: "TrocaNumeroLines");
+
+            migrationBuilder.DropColumn(
+                name: "TenantId",
+                table: "Notifications");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_MobileLines_Linha",
+                table: "MobileLines",
+                column: "Linha",
+                unique: true);
+
+            migrationBuilder.CreateTable(
+                name: "Users",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Name = table.Column<string>(type: "character varying(120)", maxLength: 120, nullable: false),
+                    Email = table.Column<string>(type: "character varying(120)", maxLength: 120, nullable: false),
+                    Phone = table.Column<string>(type: "character varying(20)", maxLength: 20, nullable: false),
+                    PasswordHash = table.Column<string>(type: "text", nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Users", x => x.Id);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Users_Email",
+                table: "Users",
+                column: "Email",
+                unique: true);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Notifications_Users_UserId",
+                table: "Notifications",
+                column: "UserId",
+                principalTable: "Users",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+        }
+    }
+}
diff --git a/Migrations/AppDbContextModelSnapshot.cs b/Migrations/AppDbContextModelSnapshot.cs
index a328ab9..8ba989b 100644
--- a/Migrations/AppDbContextModelSnapshot.cs
+++ b/Migrations/AppDbContextModelSnapshot.cs
@@ -1,4 +1,4 @@
-// <auto-generated />
+// <auto-generated />
 using System;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
@@ -22,6 +22,85 @@ namespace line_gestao_api.Migrations
 
             NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
 
+            modelBuilder.Entity("line_gestao_api.Models.ApplicationUser", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<int>("AccessFailedCount")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("ConcurrencyStamp")
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Email")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<bool>("EmailConfirmed")
+                        .HasColumnType("boolean");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("boolean");
+
+                    b.Property<DateTimeOffset?>("LockoutEnd")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<bool>("LockoutEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(120)
+                        .HasColumnType("character varying(120)");
+
+                    b.Property<string>("NormalizedEmail")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("NormalizedUserName")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("PasswordHash")
+                        .HasColumnType("text");
+
+                    b.Property<string>("PhoneNumber")
+                        .HasColumnType("text");
+
+                    b.Property<bool>("PhoneNumberConfirmed")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("SecurityStamp")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<bool>("TwoFactorEnabled")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("UserName")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NormalizedEmail");
+
+                    b.HasIndex("NormalizedUserName")
+                        .IsUnique();
+
+                    b.HasIndex("TenantId", "NormalizedEmail")
+                        .IsUnique();
+
+                    b.ToTable("AspNetUsers", (string)null);
+                });
+
             modelBuilder.Entity("line_gestao_api.Models.BillingClient", b =>
                 {
                     b.Property<Guid>("Id")
@@ -57,6 +136,9 @@ namespace line_gestao_api.Migrations
                     b.Property<int?>("QtdLinhas")
                         .HasColumnType("integer");
 
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
                     b.Property<string>("Tipo")
                         .IsRequired()
                         .HasMaxLength(2)
@@ -77,6 +159,8 @@ namespace line_gestao_api.Migrations
 
                     b.HasIndex("Item");
 
+                    b.HasIndex("TenantId");
+
                     b.HasIndex("Tipo");
 
                     b.HasIndex("Tipo", "Cliente");
@@ -169,6 +253,9 @@ namespace line_gestao_api.Migrations
                         .HasMaxLength(80)
                         .HasColumnType("character varying(80)");
 
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
                     b.Property<DateTime>("UpdatedAt")
                         .HasColumnType("timestamp with time zone");
 
@@ -204,13 +291,13 @@ namespace line_gestao_api.Migrations
 
                     b.HasIndex("Cliente");
 
-                    b.HasIndex("Linha")
-                        .IsUnique();
-
                     b.HasIndex("Skil");
 
                     b.HasIndex("Status");
 
+                    b.HasIndex("TenantId", "Linha")
+                        .IsUnique();
+
                     b.HasIndex("Usuario");
 
                     b.ToTable("MobileLines");
@@ -246,6 +333,9 @@ namespace line_gestao_api.Migrations
                     b.Property<Guid>("MobileLineId")
                         .HasColumnType("uuid");
 
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
                     b.Property<DateTime>("UpdatedAt")
                         .HasColumnType("timestamp with time zone");
 
@@ -261,93 +351,11 @@ namespace line_gestao_api.Migrations
 
                     b.HasIndex("MobileLineId");
 
+                    b.HasIndex("TenantId");
+
                     b.ToTable("MuregLines");
                 });
 
-            modelBuilder.Entity("line_gestao_api.Models.TrocaNumeroLine", b =>
-                {
-                    b.Property<Guid>("Id")
-                        .ValueGeneratedOnAdd()
-                        .HasColumnType("uuid");
-
-                    b.Property<DateTime>("CreatedAt")
-                        .HasColumnType("timestamp with time zone");
-
-                    b.Property<DateTime?>("DataTroca")
-                        .HasColumnType("timestamp with time zone");
-
-                    b.Property<string>("ICCID")
-                        .HasColumnType("text");
-
-                    b.Property<int>("Item")
-                        .HasColumnType("integer");
-
-                    b.Property<string>("LinhaAntiga")
-                        .HasColumnType("text");
-
-                    b.Property<string>("LinhaNova")
-                        .HasColumnType("text");
-
-                    b.Property<string>("Motivo")
-                        .HasColumnType("text");
-
-                    b.Property<string>("Observacao")
-                        .HasColumnType("text");
-
-                    b.Property<DateTime>("UpdatedAt")
-                        .HasColumnType("timestamp with time zone");
-
-                    b.HasKey("Id");
-
-                    b.HasIndex("DataTroca");
-
-                    b.HasIndex("ICCID");
-
-                    b.HasIndex("Item");
-
-                    b.HasIndex("LinhaAntiga");
-
-                    b.HasIndex("LinhaNova");
-
-                    b.ToTable("TrocaNumeroLines");
-                });
-
-            modelBuilder.Entity("line_gestao_api.Models.User", b =>
-                {
-                    b.Property<Guid>("Id")
-                        .ValueGeneratedOnAdd()
-                        .HasColumnType("uuid");
-
-                    b.Property<DateTime>("CreatedAt")
-                        .HasColumnType("timestamp with time zone");
-
-                    b.Property<string>("Email")
-                        .IsRequired()
-                        .HasMaxLength(120)
-                        .HasColumnType("character varying(120)");
-
-                    b.Property<string>("Name")
-                        .IsRequired()
-                        .HasMaxLength(120)
-                        .HasColumnType("character varying(120)");
-
-                    b.Property<string>("PasswordHash")
-                        .IsRequired()
-                        .HasColumnType("text");
-
-                    b.Property<string>("Phone")
-                        .IsRequired()
-                        .HasMaxLength(20)
-                        .HasColumnType("character varying(20)");
-
-                    b.HasKey("Id");
-
-                    b.HasIndex("Email")
-                        .IsUnique();
-
-                    b.ToTable("Users");
-                });
-
             modelBuilder.Entity("line_gestao_api.Models.Notification", b =>
                 {
                     b.Property<Guid>("Id")
@@ -383,6 +391,9 @@ namespace line_gestao_api.Migrations
                     b.Property<DateTime?>("ReferenciaData")
                         .HasColumnType("timestamp with time zone");
 
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
                     b.Property<string>("Tipo")
                         .IsRequired()
                         .HasColumnType("text");
@@ -411,6 +422,8 @@ namespace line_gestao_api.Migrations
 
                     b.HasIndex("Lida");
 
+                    b.HasIndex("TenantId");
+
                     b.HasIndex("UserId");
 
                     b.HasIndex("VigenciaLineId");
@@ -418,6 +431,76 @@ namespace line_gestao_api.Migrations
                     b.ToTable("Notifications");
                 });
 
+            modelBuilder.Entity("line_gestao_api.Models.Tenant", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Tenants");
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.TrocaNumeroLine", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<DateTime?>("DataTroca")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<string>("ICCID")
+                        .HasColumnType("text");
+
+                    b.Property<int>("Item")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("LinhaAntiga")
+                        .HasColumnType("text");
+
+                    b.Property<string>("LinhaNova")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Motivo")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Observacao")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("DataTroca");
+
+                    b.HasIndex("ICCID");
+
+                    b.HasIndex("Item");
+
+                    b.HasIndex("LinhaAntiga");
+
+                    b.HasIndex("LinhaNova");
+
+                    b.HasIndex("TenantId");
+
+                    b.ToTable("TrocaNumeroLines");
+                });
+
             modelBuilder.Entity("line_gestao_api.Models.UserData", b =>
                 {
                     b.Property<Guid>("Id")
@@ -454,6 +537,9 @@ namespace line_gestao_api.Migrations
                     b.Property<string>("Rg")
                         .HasColumnType("text");
 
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
                     b.Property<string>("TelefoneFixo")
                         .HasColumnType("text");
 
@@ -472,6 +558,8 @@ namespace line_gestao_api.Migrations
 
                     b.HasIndex("Linha");
 
+                    b.HasIndex("TenantId");
+
                     b.ToTable("UserDatas");
                 });
 
@@ -505,6 +593,9 @@ namespace line_gestao_api.Migrations
                     b.Property<string>("PlanoContrato")
                         .HasColumnType("text");
 
+                    b.Property<Guid>("TenantId")
+                        .HasColumnType("uuid");
+
                     b.Property<decimal?>("Total")
                         .HasColumnType("numeric");
 
@@ -524,12 +615,151 @@ namespace line_gestao_api.Migrations
 
                     b.HasIndex("Linha");
 
+                    b.HasIndex("TenantId");
+
                     b.ToTable("VigenciaLines");
                 });
 
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRole<Guid>", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("ConcurrencyStamp")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Name")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.Property<string>("NormalizedName")
+                        .HasMaxLength(256)
+                        .HasColumnType("character varying(256)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("NormalizedName")
+                        .IsUnique();
+
+                    b.ToTable("AspNetRoles", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<Guid>", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("ClaimType")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ClaimValue")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("RoleId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("RoleId");
+
+                    b.ToTable("AspNetRoleClaims", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserClaim<Guid>", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer")
+                        .HasAnnotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn);
+
+                    b.Property<string>("ClaimType")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ClaimValue")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("AspNetUserClaims", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserLogin<Guid>", b =>
+                {
+                    b.Property<string>("LoginProvider")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ProviderKey")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ProviderDisplayName")
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("LoginProvider", "ProviderKey");
+
+                    b.HasIndex("UserId");
+
+                    b.ToTable("AspNetUserLogins", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserRole<Guid>", b =>
+                {
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("RoleId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("UserId", "RoleId");
+
+                    b.HasIndex("RoleId");
+
+                    b.ToTable("AspNetUserRoles", (string)null);
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserToken<Guid>", b =>
+                {
+                    b.Property<Guid>("UserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("LoginProvider")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Name")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Value")
+                        .HasColumnType("text");
+
+                    b.HasKey("UserId", "LoginProvider", "Name");
+
+                    b.ToTable("AspNetUserTokens", (string)null);
+                });
+
+            modelBuilder.Entity("line_gestao_api.Models.MuregLine", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.MobileLine", "MobileLine")
+                        .WithMany("Muregs")
+                        .HasForeignKey("MobileLineId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.Navigation("MobileLine");
+                });
+
             modelBuilder.Entity("line_gestao_api.Models.Notification", b =>
                 {
-                    b.HasOne("line_gestao_api.Models.User", "User")
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", "User")
                         .WithMany()
                         .HasForeignKey("UserId")
                         .OnDelete(DeleteBehavior.Restrict);
@@ -544,15 +774,55 @@ namespace line_gestao_api.Migrations
                     b.Navigation("VigenciaLine");
                 });
 
-            modelBuilder.Entity("line_gestao_api.Models.MuregLine", b =>
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<Guid>", b =>
                 {
-                    b.HasOne("line_gestao_api.Models.MobileLine", "MobileLine")
-                        .WithMany("Muregs")
-                        .HasForeignKey("MobileLineId")
-                        .OnDelete(DeleteBehavior.Restrict)
+                    b.HasOne("Microsoft.AspNetCore.Identity.IdentityRole<Guid>", null)
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserClaim<Guid>", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserLogin<Guid>", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserRole<Guid>", b =>
+                {
+                    b.HasOne("Microsoft.AspNetCore.Identity.IdentityRole<Guid>", null)
+                        .WithMany()
+                        .HasForeignKey("RoleId")
+                        .OnDelete(DeleteBehavior.Cascade)
                         .IsRequired();
 
-                    b.Navigation("MobileLine");
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityUserToken<Guid>", b =>
+                {
+                    b.HasOne("line_gestao_api.Models.ApplicationUser", null)
+                        .WithMany()
+                        .HasForeignKey("UserId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
                 });
 
             modelBuilder.Entity("line_gestao_api.Models.MobileLine", b =>
diff --git a/Models/ApplicationUser.cs b/Models/ApplicationUser.cs
new file mode 100644
index 0000000..1b5bc58
--- /dev/null
+++ b/Models/ApplicationUser.cs
@@ -0,0 +1,11 @@
+using Microsoft.AspNetCore.Identity;
+
+namespace line_gestao_api.Models;
+
+public class ApplicationUser : IdentityUser<Guid>, ITenantEntity
+{
+    public string Name { get; set; } = string.Empty;
+    public Guid TenantId { get; set; }
+    public bool IsActive { get; set; } = true;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}
diff --git a/Models/BillingClient.cs b/Models/BillingClient.cs
index eef23e8..6d7f492 100644
--- a/Models/BillingClient.cs
+++ b/Models/BillingClient.cs
@@ -1,8 +1,9 @@
 namespace line_gestao_api.Models
 {
-    public class BillingClient
+    public class BillingClient : ITenantEntity
     {
         public Guid Id { get; set; }
+        public Guid TenantId { get; set; }
         public string Tipo { get; set; } = "PF"; // "PF" ou "PJ"
 
         public int Item { get; set; }
diff --git a/Models/ITenantEntity.cs b/Models/ITenantEntity.cs
new file mode 100644
index 0000000..a756f3b
--- /dev/null
+++ b/Models/ITenantEntity.cs
@@ -0,0 +1,6 @@
+namespace line_gestao_api.Models;
+
+public interface ITenantEntity
+{
+    Guid TenantId { get; set; }
+}
diff --git a/Models/MobileLine.cs b/Models/MobileLine.cs
index f4e5376..35bf9c5 100644
--- a/Models/MobileLine.cs
+++ b/Models/MobileLine.cs
@@ -2,10 +2,12 @@
 
 namespace line_gestao_api.Models
 {
-    public class MobileLine
+    public class MobileLine : ITenantEntity
     {
         public Guid Id { get; set; } = Guid.NewGuid();
 
+        public Guid TenantId { get; set; }
+
         public int Item { get; set; }
         [MaxLength(80)]
         public string? Conta { get; set; }
diff --git a/Models/MuregLine.cs b/Models/MuregLine.cs
index f076d88..1a54aa0 100644
--- a/Models/MuregLine.cs
+++ b/Models/MuregLine.cs
@@ -2,10 +2,12 @@
 
 namespace line_gestao_api.Models
 {
-    public class MuregLine
+    public class MuregLine : ITenantEntity
     {
         public Guid Id { get; set; } = Guid.NewGuid();
 
+        public Guid TenantId { get; set; }
+
         public int Item { get; set; }
 
         // Linha escolhida da GERAL no momento do mureg
diff --git a/Models/Notification.cs b/Models/Notification.cs
index 8cef548..3947dd0 100644
--- a/Models/Notification.cs
+++ b/Models/Notification.cs
@@ -2,10 +2,12 @@
 
 namespace line_gestao_api.Models;
 
-public class Notification
+public class Notification : ITenantEntity
 {
     public Guid Id { get; set; } = Guid.NewGuid();
 
+    public Guid TenantId { get; set; }
+
     [Required]
     public string Tipo { get; set; } = string.Empty;
 
@@ -29,7 +31,7 @@ public class Notification
     public string DedupKey { get; set; } = string.Empty;
 
     public Guid? UserId { get; set; }
-    public User? User { get; set; }
+    public ApplicationUser? User { get; set; }
 
     public Guid? VigenciaLineId { get; set; }
     public VigenciaLine? VigenciaLine { get; set; }
diff --git a/Models/Tenant.cs b/Models/Tenant.cs
new file mode 100644
index 0000000..7b70ab7
--- /dev/null
+++ b/Models/Tenant.cs
@@ -0,0 +1,8 @@
+namespace line_gestao_api.Models;
+
+public class Tenant
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public string Name { get; set; } = string.Empty;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}
diff --git a/Models/TrocaNumeroLine.cs b/Models/TrocaNumeroLine.cs
index 737a90d..8abb071 100644
--- a/Models/TrocaNumeroLine.cs
+++ b/Models/TrocaNumeroLine.cs
@@ -2,10 +2,12 @@
 
 namespace line_gestao_api.Models
 {
-    public class TrocaNumeroLine
+    public class TrocaNumeroLine : ITenantEntity
     {
         public Guid Id { get; set; }
 
+        public Guid TenantId { get; set; }
+
         public int Item { get; set; }
 
         public string? LinhaAntiga { get; set; }
diff --git a/Models/User.cs b/Models/User.cs
deleted file mode 100644
index f829c9e..0000000
--- a/Models/User.cs
+++ /dev/null
@@ -1,23 +0,0 @@
-using System.ComponentModel.DataAnnotations;
-
-namespace line_gestao_api.Models;
-
-public class User
-{
-    public Guid Id { get; set; } = Guid.NewGuid();
-
-    [Required, MaxLength(120)]
-    public string Name { get; set; } = string.Empty;
-
-    [Required, MaxLength(120)]
-    public string Email { get; set; } = string.Empty;
-
-    [MaxLength(20)]
-    public string Phone { get; set; } = string.Empty;
-
-
-    [Required]
-    public string PasswordHash { get; set; } = string.Empty;
-
-    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
-}
diff --git a/Models/UserData.cs b/Models/UserData.cs
index 8536fba..3308fcd 100644
--- a/Models/UserData.cs
+++ b/Models/UserData.cs
@@ -3,11 +3,13 @@ using System.ComponentModel.DataAnnotations.Schema;
 
 namespace line_gestao_api.Models
 {
-    public class UserData
+    public class UserData : ITenantEntity
     {
         [Key]
         public Guid Id { get; set; }
 
+        public Guid TenantId { get; set; }
+
         public int Item { get; set; }
 
         public string? Linha { get; set; }
diff --git a/Models/VigenciaLine.cs b/Models/VigenciaLine.cs
index 3b63c0c..f8c37c9 100644
--- a/Models/VigenciaLine.cs
+++ b/Models/VigenciaLine.cs
@@ -2,10 +2,12 @@
 
 namespace line_gestao_api.Models
 {
-    public class VigenciaLine
+    public class VigenciaLine : ITenantEntity
     {
         public Guid Id { get; set; }
 
+        public Guid TenantId { get; set; }
+
         public int Item { get; set; }
 
         public string? Conta { get; set; }
diff --git a/Program.cs b/Program.cs
index 80288eb..00e7e7d 100644
--- a/Program.cs
+++ b/Program.cs
@@ -1,8 +1,10 @@
 using System.Text;
 using line_gestao_api.Data;
+using line_gestao_api.Models;
 using line_gestao_api.Services;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.Http.Features;
+using Microsoft.AspNetCore.Identity;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.IdentityModel.Tokens;
 
@@ -31,6 +33,18 @@ builder.Services.AddDbContext<AppDbContext>(options =>
     options.UseNpgsql(builder.Configuration.GetConnectionString("Default"))
 );
 
+builder.Services.AddHttpContextAccessor();
+builder.Services.AddScoped<ITenantProvider, TenantProvider>();
+
+builder.Services.AddIdentityCore<ApplicationUser>(options =>
+    {
+        options.Password.RequiredLength = 6;
+        options.User.RequireUniqueEmail = false;
+    })
+    .AddRoles<IdentityRole<Guid>>()
+    .AddEntityFrameworkStores<AppDbContext>()
+    .AddDefaultTokenProviders();
+
 // ✅ Swagger
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
@@ -61,6 +75,8 @@ builder.Services.AddAuthorization();
 builder.Services.Configure<NotificationOptions>(builder.Configuration.GetSection("Notifications"));
 builder.Services.AddHostedService<VigenciaNotificationBackgroundService>();
 
+builder.Services.Configure<SeedOptions>(builder.Configuration.GetSection("Seed"));
+
 var app = builder.Build();
 
 if (app.Environment.IsDevelopment())
@@ -75,8 +91,11 @@ app.UseHttpsRedirection();
 app.UseCors("Front");
 
 app.UseAuthentication();
+app.UseMiddleware<TenantMiddleware>();
 app.UseAuthorization();
 
 app.MapControllers();
 
+await SeedData.EnsureSeedDataAsync(app.Services);
+
 app.Run();
diff --git a/Services/ITenantProvider.cs b/Services/ITenantProvider.cs
new file mode 100644
index 0000000..f32efc7
--- /dev/null
+++ b/Services/ITenantProvider.cs
@@ -0,0 +1,7 @@
+namespace line_gestao_api.Services;
+
+public interface ITenantProvider
+{
+    Guid? TenantId { get; }
+    void SetTenantId(Guid? tenantId);
+}
diff --git a/Services/TenantMiddleware.cs b/Services/TenantMiddleware.cs
new file mode 100644
index 0000000..1806992
--- /dev/null
+++ b/Services/TenantMiddleware.cs
@@ -0,0 +1,36 @@
+using System.Security.Claims;
+
+namespace line_gestao_api.Services;
+
+public class TenantMiddleware
+{
+    private readonly RequestDelegate _next;
+
+    public TenantMiddleware(RequestDelegate next)
+    {
+        _next = next;
+    }
+
+    public async Task InvokeAsync(HttpContext context, ITenantProvider tenantProvider)
+    {
+        Guid? tenantId = null;
+        var claim = context.User.FindFirst("tenantId")?.Value
+            ?? context.User.FindFirst("tenant")?.Value;
+
+        if (Guid.TryParse(claim, out var parsed))
+        {
+            tenantId = parsed;
+        }
+
+        tenantProvider.SetTenantId(tenantId);
+
+        try
+        {
+            await _next(context);
+        }
+        finally
+        {
+            tenantProvider.SetTenantId(null);
+        }
+    }
+}
diff --git a/Services/TenantProvider.cs b/Services/TenantProvider.cs
new file mode 100644
index 0000000..1cf34e5
--- /dev/null
+++ b/Services/TenantProvider.cs
@@ -0,0 +1,30 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+
+namespace line_gestao_api.Services;
+
+public class TenantProvider : ITenantProvider
+{
+    private readonly IHttpContextAccessor _httpContextAccessor;
+    private static readonly AsyncLocal<Guid?> CurrentTenant = new();
+
+    public TenantProvider(IHttpContextAccessor httpContextAccessor)
+    {
+        _httpContextAccessor = httpContextAccessor;
+    }
+
+    public Guid? TenantId => CurrentTenant.Value ?? ResolveFromClaims();
+
+    public void SetTenantId(Guid? tenantId)
+    {
+        CurrentTenant.Value = tenantId;
+    }
+
+    private Guid? ResolveFromClaims()
+    {
+        var claim = _httpContextAccessor.HttpContext?.User?.FindFirst("tenantId")?.Value
+            ?? _httpContextAccessor.HttpContext?.User?.FindFirst("tenant")?.Value;
+
+        return Guid.TryParse(claim, out var tenantId) ? tenantId : null;
+    }
+}
diff --git a/Services/VigenciaNotificationBackgroundService.cs b/Services/VigenciaNotificationBackgroundService.cs
index f1c46b5..9b22f1d 100644
--- a/Services/VigenciaNotificationBackgroundService.cs
+++ b/Services/VigenciaNotificationBackgroundService.cs
@@ -41,6 +41,7 @@ public class VigenciaNotificationBackgroundService : BackgroundService
         {
             using var scope = _scopeFactory.CreateScope();
             var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+            var tenantProvider = scope.ServiceProvider.GetRequiredService<ITenantProvider>();
 
             if (!await TableExistsAsync(db, "Notifications", stoppingToken))
             {
@@ -48,116 +49,20 @@ public class VigenciaNotificationBackgroundService : BackgroundService
                 return;
             }
 
-            var today = DateTime.UtcNow.Date;
-            var reminderDays = _options.ReminderDays
-                .Distinct()
-                .Where(d => d > 0)
-                .OrderBy(d => d)
-                .ToList();
-
-            var users = await db.Users.AsNoTracking()
-                .Select(u => new { u.Id, u.Name, u.Email })
-                .ToListAsync(stoppingToken);
-
-            var userByName = users
-                .Where(u => !string.IsNullOrWhiteSpace(u.Name))
-                .ToDictionary(u => u.Name.Trim().ToLowerInvariant(), u => u.Id);
-
-            var userByEmail = users
-                .Where(u => !string.IsNullOrWhiteSpace(u.Email))
-                .ToDictionary(u => u.Email.Trim().ToLowerInvariant(), u => u.Id);
-
-            var vigencias = await db.VigenciaLines.AsNoTracking()
-                .Where(v => v.DtTerminoFidelizacao != null)
-                .ToListAsync(stoppingToken);
-
-            var candidates = new List<Notification>();
-            foreach (var vigencia in vigencias)
-            {
-                if (vigencia.DtTerminoFidelizacao is null)
-                {
-                    continue;
-                }
-
-                var endDate = vigencia.DtTerminoFidelizacao.Value.Date;
-                var usuario = vigencia.Usuario?.Trim();
-                var cliente = vigencia.Cliente?.Trim();
-                var linha = vigencia.Linha?.Trim();
-                var usuarioKey = usuario?.ToLowerInvariant();
-
-                Guid? userId = null;
-                if (!string.IsNullOrWhiteSpace(usuarioKey))
-                {
-                    if (userByEmail.TryGetValue(usuarioKey, out var matchedByEmail))
-                    {
-                        userId = matchedByEmail;
-                    }
-                    else if (userByName.TryGetValue(usuarioKey, out var matchedByName))
-                    {
-                        userId = matchedByName;
-                    }
-                }
-
-                if (endDate < today)
-                {
-                    var notification = BuildNotification(
-                        tipo: "Vencido",
-                        titulo: $"Linha vencida{FormatLinha(linha)}",
-                        mensagem: $"A linha{FormatLinha(linha)} do cliente {cliente ?? "(sem cliente)"} venceu em {endDate:dd/MM/yyyy}.",
-                        referenciaData: endDate,
-                        diasParaVencer: 0,
-                        userId: userId,
-                        usuario: usuario,
-                        cliente: cliente,
-                        linha: linha,
-                        vigenciaLineId: vigencia.Id);
-
-                    candidates.Add(notification);
-                    continue;
-                }
-
-                var daysUntil = (endDate - today).Days;
-                if (reminderDays.Contains(daysUntil))
-                {
-                    var notification = BuildNotification(
-                        tipo: "AVencer",
-                        titulo: $"Linha a vencer em {daysUntil} dias{FormatLinha(linha)}",
-                        mensagem: $"A linha{FormatLinha(linha)} do cliente {cliente ?? "(sem cliente)"} vence em {endDate:dd/MM/yyyy}.",
-                        referenciaData: endDate,
-                        diasParaVencer: daysUntil,
-                        userId: userId,
-                        usuario: usuario,
-                        cliente: cliente,
-                        linha: linha,
-                        vigenciaLineId: vigencia.Id);
-
-                    candidates.Add(notification);
-                }
-            }
-
-            if (candidates.Count == 0)
+            var tenants = await db.Tenants.AsNoTracking().ToListAsync(stoppingToken);
+            if (tenants.Count == 0)
             {
+                _logger.LogWarning("Nenhum tenant encontrado para gerar notificações.");
                 return;
             }
 
-            var dedupKeys = candidates.Select(c => c.DedupKey).Distinct().ToList();
-            var existingKeys = await db.Notifications.AsNoTracking()
-                .Where(n => dedupKeys.Contains(n.DedupKey))
-                .Select(n => n.DedupKey)
-                .ToListAsync(stoppingToken);
-
-            var existingSet = new HashSet<string>(existingKeys);
-            var toInsert = candidates
-                .Where(c => !existingSet.Contains(c.DedupKey))
-                .ToList();
-
-            if (toInsert.Count == 0)
+            foreach (var tenant in tenants)
             {
-                return;
+                tenantProvider.SetTenantId(tenant.Id);
+                await ProcessTenantAsync(db, tenant.Id, stoppingToken);
             }
 
-            await db.Notifications.AddRangeAsync(toInsert, stoppingToken);
-            await db.SaveChangesAsync(stoppingToken);
+            tenantProvider.SetTenantId(null);
         }
         catch (Exception ex)
         {
@@ -189,6 +94,122 @@ public class VigenciaNotificationBackgroundService : BackgroundService
         return result is bool exists && exists;
     }
 
+    private async Task ProcessTenantAsync(AppDbContext db, Guid tenantId, CancellationToken stoppingToken)
+    {
+        var today = DateTime.UtcNow.Date;
+        var reminderDays = _options.ReminderDays
+            .Distinct()
+            .Where(d => d > 0)
+            .OrderBy(d => d)
+            .ToList();
+
+        var users = await db.Users.AsNoTracking()
+            .Select(u => new { u.Id, u.Name, u.Email })
+            .ToListAsync(stoppingToken);
+
+        var userByName = users
+            .Where(u => !string.IsNullOrWhiteSpace(u.Name))
+            .ToDictionary(u => u.Name.Trim().ToLowerInvariant(), u => u.Id);
+
+        var userByEmail = users
+            .Where(u => !string.IsNullOrWhiteSpace(u.Email))
+            .ToDictionary(u => u.Email.Trim().ToLowerInvariant(), u => u.Id);
+
+        var vigencias = await db.VigenciaLines.AsNoTracking()
+            .Where(v => v.DtTerminoFidelizacao != null)
+            .ToListAsync(stoppingToken);
+
+        var candidates = new List<Notification>();
+        foreach (var vigencia in vigencias)
+        {
+            if (vigencia.DtTerminoFidelizacao is null)
+            {
+                continue;
+            }
+
+            var endDate = vigencia.DtTerminoFidelizacao.Value.Date;
+            var usuario = vigencia.Usuario?.Trim();
+            var cliente = vigencia.Cliente?.Trim();
+            var linha = vigencia.Linha?.Trim();
+            var usuarioKey = usuario?.ToLowerInvariant();
+
+            Guid? userId = null;
+            if (!string.IsNullOrWhiteSpace(usuarioKey))
+            {
+                if (userByEmail.TryGetValue(usuarioKey, out var matchedByEmail))
+                {
+                    userId = matchedByEmail;
+                }
+                else if (userByName.TryGetValue(usuarioKey, out var matchedByName))
+                {
+                    userId = matchedByName;
+                }
+            }
+
+            if (endDate < today)
+            {
+                var notification = BuildNotification(
+                    tipo: "Vencido",
+                    titulo: $"Linha vencida{FormatLinha(linha)}",
+                    mensagem: $"A linha{FormatLinha(linha)} do cliente {cliente ?? "(sem cliente)"} venceu em {endDate:dd/MM/yyyy}.",
+                    referenciaData: endDate,
+                    diasParaVencer: 0,
+                    userId: userId,
+                    usuario: usuario,
+                    cliente: cliente,
+                    linha: linha,
+                    vigenciaLineId: vigencia.Id,
+                    tenantId: tenantId);
+
+                candidates.Add(notification);
+                continue;
+            }
+
+            var daysUntil = (endDate - today).Days;
+            if (reminderDays.Contains(daysUntil))
+            {
+                var notification = BuildNotification(
+                    tipo: "AVencer",
+                    titulo: $"Linha a vencer em {daysUntil} dias{FormatLinha(linha)}",
+                    mensagem: $"A linha{FormatLinha(linha)} do cliente {cliente ?? "(sem cliente)"} vence em {endDate:dd/MM/yyyy}.",
+                    referenciaData: endDate,
+                    diasParaVencer: daysUntil,
+                    userId: userId,
+                    usuario: usuario,
+                    cliente: cliente,
+                    linha: linha,
+                    vigenciaLineId: vigencia.Id,
+                    tenantId: tenantId);
+
+                candidates.Add(notification);
+            }
+        }
+
+        if (candidates.Count == 0)
+        {
+            return;
+        }
+
+        var dedupKeys = candidates.Select(c => c.DedupKey).Distinct().ToList();
+        var existingKeys = await db.Notifications.AsNoTracking()
+            .Where(n => dedupKeys.Contains(n.DedupKey))
+            .Select(n => n.DedupKey)
+            .ToListAsync(stoppingToken);
+
+        var existingSet = new HashSet<string>(existingKeys);
+        var toInsert = candidates
+            .Where(c => !existingSet.Contains(c.DedupKey))
+            .ToList();
+
+        if (toInsert.Count == 0)
+        {
+            return;
+        }
+
+        await db.Notifications.AddRangeAsync(toInsert, stoppingToken);
+        await db.SaveChangesAsync(stoppingToken);
+    }
+
     private static Notification BuildNotification(
         string tipo,
         string titulo,
@@ -199,7 +220,8 @@ public class VigenciaNotificationBackgroundService : BackgroundService
         string? usuario,
         string? cliente,
         string? linha,
-        Guid vigenciaLineId)
+        Guid vigenciaLineId,
+        Guid tenantId)
     {
         return new Notification
         {
@@ -215,7 +237,8 @@ public class VigenciaNotificationBackgroundService : BackgroundService
             Usuario = usuario,
             Cliente = cliente,
             Linha = linha,
-            VigenciaLineId = vigenciaLineId
+            VigenciaLineId = vigenciaLineId,
+            TenantId = tenantId
         };
     }
 
diff --git a/appsettings.Development.json b/appsettings.Development.json
index 233e874..2ed524a 100644
--- a/appsettings.Development.json
+++ b/appsettings.Development.json
@@ -8,5 +8,11 @@
   "Notifications": {
     "CheckIntervalMinutes": 60,
     "ReminderDays": [30, 15, 7]
+  },
+  "Seed": {
+    "DefaultTenantName": "Default",
+    "AdminName": "Administrador",
+    "AdminEmail": "admin@linegestao.local",
+    "AdminPassword": "Admin123!"
   }
 }
diff --git a/appsettings.json b/appsettings.json
index 429939a..93d1a76 100644
--- a/appsettings.json
+++ b/appsettings.json
@@ -11,5 +11,11 @@
   "Notifications": {
     "CheckIntervalMinutes": 60,
     "ReminderDays": [30, 15, 7]
+  },
+  "Seed": {
+    "DefaultTenantName": "Default",
+    "AdminName": "Administrador",
+    "AdminEmail": "admin@linegestao.local",
+    "AdminPassword": "Admin123!"
   }
 }
diff --git a/line-gestao-api.csproj b/line-gestao-api.csproj
index e1c6df6..00b820a 100644
--- a/line-gestao-api.csproj
+++ b/line-gestao-api.csproj
@@ -25,6 +25,7 @@
 	<ItemGroup>
 		<PackageReference Include="ClosedXML" Version="0.105.0" />
 		<PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.1" />
+		<PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="10.0.1" />
 		<PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.1" />
 		<PackageReference Include="Microsoft.EntityFrameworkCore" Version="10.0.1" />
 		<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.1">