diff --git a/src/food-market.api/Seed/DevDataSeeder.cs b/src/food-market.api/Seed/DevDataSeeder.cs
index 0bdfe89..403c262 100644
--- a/src/food-market.api/Seed/DevDataSeeder.cs
+++ b/src/food-market.api/Seed/DevDataSeeder.cs
@@ -63,36 +63,63 @@ public async Task StartAsync(CancellationToken ct)
 
         await SeedTenantReferencesAsync(db, demoOrg.Id, ct);
 
-        const string adminEmail = "admin@food-market.local";
-        var admin = await userMgr.FindByEmailAsync(adminEmail);
-        if (admin is null)
+        // SuperAdmin платформы — без OrganizationId, видит все организации
+        const string superAdminEmail = "admin@food-market.local";
+        var superAdmin = await userMgr.FindByEmailAsync(superAdminEmail);
+        if (superAdmin is null)
         {
-            admin = new User
+            superAdmin = new User
             {
-                UserName = adminEmail,
-                Email = adminEmail,
+                UserName = superAdminEmail,
+                Email = superAdminEmail,
                 EmailConfirmed = true,
-                FullName = "System Admin",
-                OrganizationId = demoOrg.Id,
+                FullName = "Platform SuperAdmin",
+                OrganizationId = null,
             };
-            var result = await userMgr.CreateAsync(admin, "Admin12345!");
+            var result = await userMgr.CreateAsync(superAdmin, "Admin12345!");
             if (result.Succeeded)
-            {
-                // Только SuperAdmin как Identity-роль. «Администратор» —
-                // организационная роль внутри Employee, не Identity.
-                await userMgr.AddToRoleAsync(admin, SystemRoles.SuperAdmin);
-            }
+                await userMgr.AddToRoleAsync(superAdmin, SystemRoles.SuperAdmin);
         }
         else
         {
-            if (!await userMgr.IsInRoleAsync(admin, SystemRoles.SuperAdmin))
-                await userMgr.AddToRoleAsync(admin, SystemRoles.SuperAdmin);
-            // Чистим дублирующую Identity-роль Admin (если оставалась с прошлых сидов).
-            if (await userMgr.IsInRoleAsync(admin, SystemRoles.Admin))
-                await userMgr.RemoveFromRoleAsync(admin, SystemRoles.Admin);
+            // Исправляем старую БД: убираем OrganizationId и пересаживаем на SuperAdmin
+            if (superAdmin.OrganizationId is not null)
+            {
+                superAdmin.OrganizationId = null;
+                await userMgr.UpdateAsync(superAdmin);
+            }
+            var roles = await userMgr.GetRolesAsync(superAdmin);
+            if (!roles.Contains(SystemRoles.SuperAdmin))
+            {
+                await userMgr.RemoveFromRolesAsync(superAdmin, roles);
+                await userMgr.AddToRoleAsync(superAdmin, SystemRoles.SuperAdmin);
+            }
         }
 
-        await SeedAdminEmployeeAsync(db, demoOrg.Id, admin?.Id, ct);
+        // Admin демо-организации — владелец/директор Demo Market
+        const string demoAdminEmail = "admin@demo-market.local";
+        var demoAdmin = await userMgr.FindByEmailAsync(demoAdminEmail);
+        if (demoAdmin is null)
+        {
+            demoAdmin = new User
+            {
+                UserName = demoAdminEmail,
+                Email = demoAdminEmail,
+                EmailConfirmed = true,
+                FullName = "Demo Market Admin",
+                OrganizationId = demoOrg.Id,
+            };
+            var result = await userMgr.CreateAsync(demoAdmin, "Admin12345!");
+            if (result.Succeeded)
+                await userMgr.AddToRoleAsync(demoAdmin, SystemRoles.Admin);
+        }
+        else
+        {
+            if (!await userMgr.IsInRoleAsync(demoAdmin, SystemRoles.Admin))
+                await userMgr.AddToRoleAsync(demoAdmin, SystemRoles.Admin);
+        }
+
+        await SeedAdminEmployeeAsync(db, demoOrg.Id, superAdmin?.Id, ct);
 
         // Глобальные SystemSettings — single-row. Сидируем дефолт 30 дней
         // retention если ещё нет записи.