CREATE TABLE IF NOT EXISTS content_reports (
    id BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
    reporter_user_id BIGINT NOT NULL,
    room_id BIGINT,
    target_type SMALLINT NOT NULL,
    target_room_id BIGINT,
    target_user_id BIGINT,
    target_member_room_id BIGINT,
    target_member_user_id BIGINT,
    target_chat_message_id BIGINT,
    target_chat_message_created_at TIMESTAMPTZ,
    reason_code TEXT NOT NULL,
    reason TEXT NOT NULL DEFAULT '',
    metadata JSONB,
    status SMALLINT NOT NULL DEFAULT 1,
    reviewed_by BIGINT,
    reviewed_at TIMESTAMPTZ,
    resolution_note TEXT NOT NULL DEFAULT '',
    created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
    CHECK (metadata IS NULL OR jsonb_typeof(metadata) = 'object'),
    FOREIGN KEY (reporter_user_id) REFERENCES users(id) ON DELETE RESTRICT,
    FOREIGN KEY (reviewed_by) REFERENCES users(id) ON DELETE SET NULL
);

CREATE INDEX IF NOT EXISTS idx_content_reports_reporter_created
    ON content_reports(reporter_user_id, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_content_reports_room_created
    ON content_reports(room_id, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_content_reports_target_room
    ON content_reports(target_room_id, created_at DESC)
    WHERE target_room_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_content_reports_target_user
    ON content_reports(target_user_id, created_at DESC)
    WHERE target_user_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_content_reports_target_member
    ON content_reports(target_member_room_id, target_member_user_id, created_at DESC)
    WHERE target_member_room_id IS NOT NULL AND target_member_user_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_content_reports_target_chat_message
    ON content_reports(room_id, target_chat_message_id, target_chat_message_created_at)
    WHERE target_chat_message_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_content_reports_status_created
    ON content_reports(status, created_at DESC);
CREATE INDEX IF NOT EXISTS idx_content_reports_reason_code_trgm
    ON content_reports USING gin(reason_code gin_trgm_ops);
CREATE INDEX IF NOT EXISTS idx_content_reports_reason_trgm
    ON content_reports USING gin(reason gin_trgm_ops);