Junie: add user permissions to databases.

database/migrations/000002_add_database_users.down.sql

@@ -0,0 +1,4 @@
+-- Drop the database_users table and its indexes
+DROP INDEX IF EXISTS idx_database_users_db_id;
+DROP INDEX IF EXISTS idx_database_users_uid;
+DROP TABLE IF EXISTS database_users;

database/migrations/000002_add_database_users.up.sql

@@ -0,0 +1,12 @@
+-- Add database_users table to associate users with databases
+CREATE TABLE database_users (
+    id TEXT PRIMARY KEY,
+    uid TEXT NOT NULL,
+    db_id TEXT NOT NULL,
+    FOREIGN KEY(uid) REFERENCES users(id),
+    FOREIGN KEY(db_id) REFERENCES database(id)
+);
+
+-- Add index for faster lookups
+CREATE INDEX idx_database_users_uid ON database_users(uid);
+CREATE INDEX idx_database_users_db_id ON database_users(db_id);