feat(history): 实现三模历史搜索、每日智能协同摘要与时间轴侧栏 (Phase P2)

deploy/postgres/context_init.sql

@@ -118,6 +118,34 @@ CREATE TABLE IF NOT EXISTS chat_messages (
 CREATE INDEX IF NOT EXISTS idx_chat_messages_sid_time ON chat_messages(session_id, created_at ASC);
 CREATE INDEX IF NOT EXISTS idx_chat_messages_sid_day_id ON chat_messages(session_id, day_key DESC, id DESC);
 CREATE INDEX IF NOT EXISTS idx_chat_messages_sid_category ON chat_messages(session_id, category, id DESC);
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+CREATE INDEX IF NOT EXISTS idx_chat_messages_content_trgm ON chat_messages USING GIN (content gin_trgm_ops);
+
+-- 4.1 每日智能摘要表 (Daily Digests)
+CREATE TABLE IF NOT EXISTS chat_daily_digests (
+    id               BIGSERIAL PRIMARY KEY,
+    session_id       TEXT NOT NULL REFERENCES chat_sessions(session_id) ON DELETE CASCADE,
+    project_id       BIGINT REFERENCES projects(id) ON DELETE SET NULL,
+    day_key          DATE NOT NULL,
+    headline         TEXT NOT NULL DEFAULT '',
+    key_points       JSONB NOT NULL DEFAULT '[]'::jsonb,
+    deliverables     JSONB NOT NULL DEFAULT '[]'::jsonb,
+    decisions        JSONB NOT NULL DEFAULT '[]'::jsonb,
+    open_questions   JSONB NOT NULL DEFAULT '[]'::jsonb,
+    stage_progress   TEXT NOT NULL DEFAULT '',
+    first_message_id BIGINT,
+    last_message_id  BIGINT,
+    message_count    INT NOT NULL DEFAULT 0,
+    status           TEXT NOT NULL DEFAULT 'pending',
+    source           TEXT NOT NULL DEFAULT '',
+    model            TEXT NOT NULL DEFAULT '',
+    token_usage      INT NOT NULL DEFAULT 0,
+    digest_version   INT NOT NULL DEFAULT 1,
+    generated_at     TIMESTAMPTZ,
+    updated_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE (session_id, day_key)
+);
+CREATE INDEX IF NOT EXISTS idx_digests_sid_day ON chat_daily_digests(session_id, day_key DESC);
 
 -- -----------------------------------------------------------------------------
 -- 5. CAS 物理文件寻址与引用去重表 (Storage Blobs & File References)

deploy/postgres/migrations/2026-09-10-chat-daily-digests-and-search.sql

@@ -0,0 +1,41 @@
+-- ==============================================================================
+-- 迁移脚本: pg_trgm 搜索基础设施与 chat_daily_digests 按日智能摘要表
+-- 日期: 2026-09-10
+-- 描述:
+--   1. 启用 pg_trgm 扩展以支持中文/英文 trigram 快速文本检索与相似度计算
+--   2. 为 chat_messages(content) 创建 GIN Trigram 索引 (idx_chat_messages_content_trgm)
+--   3. 创建 chat_daily_digests 表与 (session_id, day_key DESC) 索引
+-- ==============================================================================
+
+-- 1. 扩展与搜索索引
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+
+CREATE INDEX IF NOT EXISTS idx_chat_messages_content_trgm
+    ON chat_messages USING GIN (content gin_trgm_ops);
+
+-- 2. 按日智能摘要表
+CREATE TABLE IF NOT EXISTS chat_daily_digests (
+    id               BIGSERIAL PRIMARY KEY,
+    session_id       TEXT NOT NULL REFERENCES chat_sessions(session_id) ON DELETE CASCADE,
+    project_id       BIGINT REFERENCES projects(id) ON DELETE SET NULL,
+    day_key          DATE NOT NULL,
+    headline         TEXT NOT NULL DEFAULT '',            -- 一句话日总结 (≤40 字)
+    key_points       JSONB NOT NULL DEFAULT '[]'::jsonb, -- 工作要点 (string[])
+    deliverables     JSONB NOT NULL DEFAULT '[]'::jsonb, -- 当日产出 [{doc_id,title,state}]
+    decisions        JSONB NOT NULL DEFAULT '[]'::jsonb, -- 当日拍板决策 (string[])
+    open_questions   JSONB NOT NULL DEFAULT '[]'::jsonb, -- 未决事项 (string[])
+    stage_progress   TEXT NOT NULL DEFAULT '',           -- 当日阶段推进 (如 V0.1→V0.5)
+    first_message_id BIGINT,                             -- 当日首条消息 (跳转锚点)
+    last_message_id  BIGINT,
+    message_count    INT NOT NULL DEFAULT 0,
+    status           TEXT NOT NULL DEFAULT 'pending',    -- pending|generating|ready|fallback|failed
+    source           TEXT NOT NULL DEFAULT '',           -- llm | rule
+    model            TEXT NOT NULL DEFAULT '',
+    token_usage      INT NOT NULL DEFAULT 0,
+    digest_version   INT NOT NULL DEFAULT 1,             -- 当日增量再生成时 +1
+    generated_at     TIMESTAMPTZ,
+    updated_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE (session_id, day_key)
+);
+
+CREATE INDEX IF NOT EXISTS idx_digests_sid_day ON chat_daily_digests(session_id, day_key DESC);