CREATE TABLE IF NOT EXISTS notifications (
    id BIGINT GENERATED BY DEFAULT AS IDENTITY NOT NULL,
    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE RESTRICT,
    type SMALLINT NOT NULL,
    title VARCHAR(255) NOT NULL,
    content TEXT NOT NULL,
    data JSONB NOT NULL,
    is_read BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    CHECK (jsonb_typeof(data) = 'object'),
    PRIMARY KEY (id, created_at)
) PARTITION BY RANGE (created_at);

CREATE INDEX IF NOT EXISTS idx_notifications_user_read_created
    ON notifications(user_id, is_read, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_notifications_user_unread
    ON notifications(user_id, created_at DESC)
    WHERE is_read = FALSE;
CREATE INDEX IF NOT EXISTS idx_notifications_user_type_created
    ON notifications(user_id, type, created_at DESC)
    WHERE is_read = FALSE;
CREATE INDEX IF NOT EXISTS idx_notifications_title_trgm
    ON notifications USING gin(title gin_trgm_ops);
CREATE INDEX IF NOT EXISTS idx_notifications_content_trgm
    ON notifications USING gin(content gin_trgm_ops);

CREATE TRIGGER trigger_update_notifications_updated_at
    BEFORE UPDATE ON notifications
    FOR EACH ROW
    EXECUTE FUNCTION update_updated_at_column();