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)