feat(db): initial database module

migrate.py

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+import sqlite3
+def migrate(path): conn = sqlite3.connect(path); conn.close()
+if __name__ == '__main__': migrate('app.db')

schema.sql

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+CREATE TABLE users (id INTEGER PRIMARY KEY AUTOINCREMENT, username TEXT UNIQUE NOT NULL, email TEXT UNIQUE NOT NULL, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP);

seed.sql

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+INSERT INTO users (username, email) VALUES ('admin', 'admin@test.com');