+------------------------------------------+
|               Users                      |
+------------------------------------------+
| id            PK, AI                     |
| name          VARCHAR                    |
| email         VARCHAR                    |
| password      VARCHAR                    |
+------------------------------------------+

+------------------------------------------+
|               Roles                      |
+------------------------------------------+
| id            PK, AI                     |
| name          VARCHAR                    |
| description   VARCHAR                    |
+------------------------------------------+

+------------------------------------------+
|              Modules                    |
+------------------------------------------+
| id            PK, AI                     |
| name          VARCHAR                    |
| description   VARCHAR                    |
+------------------------------------------+

+------------------------------------------+
|             Permissions                  |
+------------------------------------------+
| id            PK, AI                     |
| name          VARCHAR                    |
| description   VARCHAR                    |
| module_id     FK (Modules), CASCADE      |
+------------------------------------------+

+------------------------------------------+
|         User Roles                       |
+------------------------------------------+
| user_id       FK (Users), CASCADE        |
| role_id       FK (Roles), CASCADE        |
+------------------------------------------+

+------------------------------------------+
|        Role Permissions                  |
+------------------------------------------+
| role_id       FK (Roles), CASCADE        |
| permission_id FK (Permissions), CASCADE |
+------------------------------------------+