fix(ops): harden cold-start schedule recovery

apps/api/migrations/embedding_bge_m3_1024.sql

@@ -6,8 +6,9 @@
 --   bge-m3 產生 1024 維向量，現有 schema vector(768) 不相容，INSERT 會直接失敗
 --
 -- 影響範圍：
---   1. rag_chunks.embedding          vector(768) → vector(1024)
---   2. playbook_embeddings.embedding vector(768) → vector(1024)
+--   1. knowledge_entries.embedding   vector(768) → vector(1024)
+--   2. rag_chunks.embedding          vector(768) → vector(1024)
+--   3. playbook_embeddings.embedding vector(768) → vector(1024)
 --
 -- 遷移策略：清空現有向量資料，切換維度後由 re-embed script 重新嵌入
 -- 現有向量資料若要保留，需先 dump 用 nomic 格式備份（舊維度無法轉換）
@@ -21,7 +22,24 @@
 
 BEGIN;
 
--- 1. rag_chunks：清空向量資料，變更欄位維度
+-- 1. knowledge_entries：備份舊向量並清空，變更欄位維度
+CREATE TABLE IF NOT EXISTS knowledge_entries_embedding_backup_20260505 AS
+SELECT
+    id,
+    embedding::text AS embedding_768,
+    NOW() AS backed_up_at
+FROM knowledge_entries
+WHERE embedding IS NOT NULL;
+
+ALTER TABLE knowledge_entries
+    ALTER COLUMN embedding TYPE vector(1024)
+    USING NULL;  -- 清空現有 768 維向量（維度不可轉換）
+
+COMMENT ON COLUMN knowledge_entries.embedding IS
+    'bge-m3:latest 1024 維向量 — 遷移自 nomic-embed-text 768 維 (2026-05-05 ADR-110 follow-up)';
+
+
+-- 2. rag_chunks：清空向量資料，變更欄位維度
 --    ivfflat index 必須先 DROP 才能 ALTER COLUMN
 DROP INDEX IF EXISTS idx_rag_chunks_embedding;
 
@@ -39,7 +57,7 @@ COMMENT ON COLUMN rag_chunks.embedding IS
     'bge-m3:latest 1024 維向量 — 遷移自 nomic-embed-text 768 維 (2026-05-04 ADR-110)';
 
 
--- 2. playbook_embeddings：清空向量資料，變更欄位維度
+-- 3. playbook_embeddings：清空向量資料，變更欄位維度
 DROP INDEX IF EXISTS ix_playbook_embeddings_vec;
 
 ALTER TABLE playbook_embeddings
@@ -61,9 +79,15 @@ COMMENT ON TABLE playbook_embeddings IS
 -- 3. 驗證遷移結果
 DO $$
 DECLARE
+    v_km_dim integer;
     v_rag_dim integer;
     v_pb_dim integer;
 BEGIN
+    SELECT atttypmod INTO v_km_dim
+    FROM pg_attribute
+    JOIN pg_class ON attrelid = pg_class.oid
+    WHERE relname = 'knowledge_entries' AND attname = 'embedding';
+
     SELECT atttypmod INTO v_rag_dim
     FROM pg_attribute
     JOIN pg_class ON attrelid = pg_class.oid
@@ -74,15 +98,18 @@ BEGIN
     JOIN pg_class ON attrelid = pg_class.oid
     WHERE relname = 'playbook_embeddings' AND attname = 'embedding';
 
-    -- atttypmod for vector(1024) = 1024 + 1 = 1025
-    IF v_rag_dim != 1025 THEN
-        RAISE EXCEPTION 'rag_chunks.embedding 維度驗證失敗：expected 1025, got %', v_rag_dim;
+    -- pgvector atttypmod stores the configured dimension.
+    IF v_km_dim != 1024 THEN
+        RAISE EXCEPTION 'knowledge_entries.embedding 維度驗證失敗：expected 1024, got %', v_km_dim;
     END IF;
-    IF v_pb_dim != 1025 THEN
-        RAISE EXCEPTION 'playbook_embeddings.embedding 維度驗證失敗：expected 1025, got %', v_pb_dim;
+    IF v_rag_dim != 1024 THEN
+        RAISE EXCEPTION 'rag_chunks.embedding 維度驗證失敗：expected 1024, got %', v_rag_dim;
+    END IF;
+    IF v_pb_dim != 1024 THEN
+        RAISE EXCEPTION 'playbook_embeddings.embedding 維度驗證失敗：expected 1024, got %', v_pb_dim;
     END IF;
 
-    RAISE NOTICE '✅ embedding 遷移驗證通過：rag_chunks 和 playbook_embeddings 均為 vector(1024)';
+    RAISE NOTICE '✅ embedding 遷移驗證通過：knowledge_entries、rag_chunks、playbook_embeddings 均為 vector(1024)';
 END $$;
 
 COMMIT;

apps/api/src/services/k3s_monitor_service.py

@@ -34,8 +34,12 @@ logger = structlog.get_logger(__name__)
 # 台北時區
 TZ_TAIPEI = ZoneInfo("Asia/Taipei")
 
-# Prometheus 端點
-PROMETHEUS_URL = "http://192.168.0.121:30090"
+# Prometheus endpoint.
+#
+# 2026-05-05 Codex: do not pin this report job to a K3s worker NodePort.
+# Production already injects PROMETHEUS_URL from ConfigMap, currently the
+# Docker Prometheus on 110. This keeps reboot recovery independent of 121.
+PROMETHEUS_URL = settings.PROMETHEUS_URL.rstrip("/")
 
 # kube-state-metrics 查詢
 PROM_QUERIES = {
@@ -215,7 +219,7 @@ class K3sMonitorService:
 
             # 發送訊息
             formatted = status.format()
-            result = await gateway.send_message(formatted)
+            result = await gateway.send_text(formatted)
 
             if result:
                 logger.info("k3s_daily_report_sent", date=status.report_date)

apps/api/src/services/weekly_report_service.py

@@ -244,7 +244,7 @@ class WeeklyReportService:
 
             # 發送訊息
             formatted = report.format()
-            result = await gateway.send_message(formatted)
+            result = await gateway.send_text(formatted)
 
             if result:
                 logger.info("weekly_report_sent", week=report.week_range)