back photo + event tags and persons

back/context/UserContext.cs

@@ -0,0 +1,48 @@
+using back.DataModels;
+using Microsoft.EntityFrameworkCore;
+
+namespace back.context;
+
+public class UserContext : DbContext
+{
+    public DbSet<UserModel> Users { get; set; }
+    public UserContext(DbContextOptions<UserContext> options) : base(options)
+    {
+        // Ensure database is created
+        Database.EnsureCreated();
+    }
+
+    public async Task<UserModel?> GetById(Guid id)
+    {
+        return await Users.FindAsync(id);
+    }
+
+    public async Task<int> GetTotalItems()
+    {
+        return await Users.CountAsync();
+    }
+
+    public async Task<IEnumerable<UserModel>> GetPage(int page = 1, int pageSize = 20)
+    {
+        if (page < 1) page = 1;
+        if (pageSize < 1) pageSize = 20;
+
+        return await Users
+            .OrderByDescending(p => p.CreatedAt)
+            .Skip((page - 1) * pageSize)
+            .Take(pageSize)
+            .ToListAsync();
+    }
+
+    public async Task<bool> Exists(UserModel? photo)
+    {
+        if (photo == null) return false;
+        if (string.IsNullOrEmpty(photo.Id)) return false;
+        return await Users.AnyAsync(p => p.Id == photo.Id);
+    }
+
+    public async Task<bool> Exists(string id)
+    {
+        return await Users.AnyAsync(p => p.Id == id);
+    }
+}