feat: per-user feedback AI prompt template with placeholder keys

db/init.sql

@@ -214,6 +214,14 @@ CREATE TABLE IF NOT EXISTS user_branches (
   PRIMARY KEY (user_id, branch_id)
 );
 
+CREATE TABLE IF NOT EXISTS user_settings (
+  user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  key TEXT NOT NULL,
+  value TEXT,
+  updated_at TIMESTAMPTZ DEFAULT now(),
+  PRIMARY KEY (user_id, key)
+);
+
 CREATE TABLE IF NOT EXISTS sessions (
   id SERIAL PRIMARY KEY,
   user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,