Update user deletion to reassign roles and fix foreign key constraint violations

Update the deleteUser function in DatabaseStorage to reassign roles assigned by the deleted user to the admin user, resolving a foreign key constraint error when deleting the 'system' user.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: a8a78c07-e900-425c-a577-5b4c5894379d
Replit-Commit-Checkpoint-Type: full_checkpoint
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server/storage.ts

@@ -420,10 +420,16 @@ export class DatabaseStorage implements IStorage {
         .set({ createdBy: adminUserId })
         .where(eq(nocodbConfig.createdBy, id));
       
+      // Update role assignments made BY this user (assignedBy field)
+      await tx
+        .update(userRoles)
+        .set({ assignedBy: adminUserId })
+        .where(eq(userRoles.assignedBy, id));
+      
       // Delete user-group assignments
       await tx.delete(userGroups).where(eq(userGroups.userId, id));
       
-      // Delete user-role assignments
+      // Delete user-role assignments TO this user
       await tx.delete(userRoles).where(eq(userRoles.userId, id));
       
       // Finally delete the user