CREATE TABLE IF NOT EXISTS pads (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    slug TEXT NOT NULL UNIQUE,
    title TEXT NOT NULL,
    content TEXT NOT NULL DEFAULT '',
    password_hash TEXT,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS revisions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    pad_id INTEGER NOT NULL,
    content TEXT NOT NULL,
    created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (pad_id) REFERENCES pads(id) ON DELETE CASCADE
);

CREATE INDEX IF NOT EXISTS idx_revisions_pad_id ON revisions(pad_id, id DESC);