ALTER TABLE workspaces
    ADD COLUMN setting_sync_dir TEXT;

CREATE TABLE sync_states
(
    id           TEXT                               NOT NULL
        PRIMARY KEY,
    model        TEXT     DEFAULT 'sync_state'      NOT NULL,
    workspace_id TEXT                               NOT NULL
        REFERENCES workspaces
            ON DELETE CASCADE,
    created_at   DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
    updated_at   DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
    flushed_at   DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
    checksum     TEXT                               NOT NULL,
    model_id     TEXT                               NOT NULL,
    sync_dir     TEXT                               NOT NULL,
    rel_path     TEXT                               NOT NULL,

    UNIQUE (workspace_id, model_id)
);