feat: init db module with schema, seed and migration

migrate.py

@@ -0,0 +1,21 @@
+import sqlite3
+import os
+
+DB_PATH = 'app.db'
+
+def migrate():
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+    
+    with open('schema.sql', 'r') as f:
+        cursor.executescript(f.read())
+    
+    with open('seed.sql', 'r') as f:
+        cursor.executescript(f.read())
+    
+    conn.commit()
+    conn.close()
+    print(f"Database migrated: {DB_PATH}")
+
+if __name__ == '__main__':
+    migrate()