ALTER TABLE ias_context_messages
    ADD COLUMN IF NOT EXISTS raw_message JSONB;

ALTER TABLE ias_context_messages
    ADD COLUMN IF NOT EXISTS external_message_id VARCHAR(255);

CREATE UNIQUE INDEX IF NOT EXISTS idx_ias_context_messages_external_unique
    ON ias_context_messages(session_id, role, external_message_id)
    WHERE external_message_id IS NOT NULL;

WITH ranked AS (
    SELECT
        id,
        ROW_NUMBER() OVER (
            PARTITION BY scope_key
            ORDER BY started_at DESC, id DESC
        ) AS rank
    FROM ias_context_sessions
    WHERE ended_at IS NULL
)
UPDATE ias_context_sessions AS session
SET
    ended_at = last_message_at,
    end_reason = 'active_session_deduplicated',
    summary = COALESCE(summary, '创建活跃会话唯一约束时自动结束的重复活跃上下文。')
FROM ranked
WHERE session.id = ranked.id
    AND ranked.rank > 1;

CREATE UNIQUE INDEX IF NOT EXISTS idx_ias_context_sessions_one_active
    ON ias_context_sessions(scope_key)
    WHERE ended_at IS NULL;

CREATE TABLE IF NOT EXISTS ias_tool_call_instructions (
    id BIGSERIAL PRIMARY KEY,
    scope_key VARCHAR(768) NOT NULL UNIQUE,
    channel VARCHAR(64) NOT NULL,
    account_id VARCHAR(255) NOT NULL,
    from_user_id VARCHAR(255) NOT NULL,
    context_label TEXT,
    content TEXT NOT NULL DEFAULT '',
    last_reason TEXT,
    updated_by VARCHAR(64) NOT NULL DEFAULT 'ai',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_ias_tool_call_instructions_scope_updated
    ON ias_tool_call_instructions(scope_key, updated_at DESC);

INSERT INTO ias_tool_call_instructions (
    scope_key,
    channel,
    account_id,
    from_user_id,
    context_label,
    content,
    last_reason,
    updated_by,
    created_at,
    updated_at
)
SELECT
    scope_key,
    channel,
    account_id,
    from_user_id,
    context_label,
    content,
    last_reason,
    updated_by,
    created_at,
    updated_at
FROM ias_additional_system_prompts
WHERE content <> ''
ON CONFLICT (scope_key) DO NOTHING;