New project_role table to represent possible roles

backend/internal/database/migrations/0049_project_role.sql

@@ -0,0 +1,9 @@
+-- This table represents the possible role a user can have in a project.
+-- It has nothing to do with the site admin table.
+CREATE TABLE IF NOT EXISTS project_role (
+    p_role TEXT PRIMARY KEY
+);
+
+-- Insert the possible roles a user can have in a project.
+INSERT OR IGNORE INTO project_role (p_role) VALUES ('admin');
+INSERT OR IGNORE INTO project_role (p_role) VALUES ('member');

backend/internal/database/migrations/0050_user_roles.sql

@@ -1,16 +1,9 @@
 CREATE TABLE IF NOT EXISTS user_roles (
   user_id INTEGER NOT NULL,
   project_id INTEGER NOT NULL,
-  role STRING NOT NULL, -- 'admin' or 'member'
+  p_role TEXT NOT NULL, -- 'admin' or 'member'
   FOREIGN KEY (user_id) REFERENCES users (id)
   FOREIGN KEY (project_id) REFERENCES projects (id)
+  FOREIGN KEY (p_role) REFERENCES project_role (p_role)
   PRIMARY KEY (user_id, project_id)
 );
-
--- Make sure that the role is either 'admin' or 'member'
-CREATE TRIGGER IF NOT EXISTS user_role_admin_or_member
-  BEFORE INSERT ON user_roles
-  FOR EACH ROW
-  BEGIN
-    SELECT RAISE(ABORT, 'Invalid role') WHERE NEW.role NOT IN ('admin', 'member');
-  END;