fix: transplant PG init backfill rollback scope + audit-loop state upsert registration (code-to10 v2, from 854f810)

- db: translate INSERT OR IGNORE ... SELECT to ON CONFLICT DO NOTHING;
  register task_audit_loop_state (task_id) in _OR_REPLACE_PK (direct port).
- server: _backfill_default_quotas uses SAVEPOINT containment, no longer
  commits the caller's transaction (direct port; callers are init_db only).
- worker: NOT ported — integration _coord_child_rows has no column-fallback
  retry loop, so the InFailedSqlTransaction cascade site does not exist here.
- tests: rewritten for the integration base (no cloud.audit_loop /
  _coord_audit_loop_merge here); real-PG cases skip without DSN/driver.

(cherry picked from commit 79e6843610fcd275af874e7b4afc57af7ffa579e)

cloud/db.py

@@ -325,7 +325,9 @@ def _load_postgres_driver():
 #   （语义弱于 REPLACE，调用点只有 project_members 与
 #   slack_users 两张已知主键表，不会走到退化分支）。
 # - ``INSERT OR IGNORE`` -> ``ON CONFLICT DO NOTHING``：无冲突
-#   目标，任何唯一冲突都跳过，不改已有行。
+#   目标，任何唯一冲突都跳过，不改已有行；VALUES 形与
+#   SELECT 形两种写法都翻译（SELECT 形漏翻曾致新鲜 PG 库
+#   init 失败，见 _OR_IGNORE_SELECT_RE）。
 # - ``PRAGMA table_info(<表>)`` -> information_schema 查询，
 #   返回 (cid, name, type, notnull, dflt_value, pk) 六元组，
 #   与 sqlite 的 PRAGMA table_info 行形状一致，调用方取 row[1]
@@ -423,6 +425,13 @@ _OR_REPLACE_PK = {
     "memory_settings": ("user_id",),
     "task_memory_flags": ("task_id",),
     "memory_extraction_log": ("task_id",),
+    # 审计循环状态单行表：主键 task_id。未登记时 Postgres 下
+    # INSERT OR REPLACE 退化为 ON CONFLICT DO NOTHING，已存在
+    # 行的 round / last_decision 等更新静默丢弃（2026-10-31
+    # PG 验证实测：跨进程竞态中包 round=2 而状态表 round 恒
+    # 为 1、轮次耗尽时 last_decision 仍为 pushback；SQLite
+    # 原生 OR REPLACE 测不出来，与自动记忆三张表同款坑）。
+    "task_audit_loop_state": ("task_id",),
 }
 
 _IDENTITY_TABLES = frozenset(
@@ -437,6 +446,13 @@ _OR_IGNORE_RE = _re.compile(
     r"^\s*INSERT\s+OR\s+IGNORE\s+INTO\s+(\w+)\s*\(([^)]+)\)\s*"
     r"VALUES\s*\((.*)\)\s*$",
     _re.IGNORECASE | _re.DOTALL)
+# INSERT OR IGNORE ... SELECT 形（VALUES 形之外的第二种写法，
+# 如配额回填）：PG 没有 OR IGNORE 语法，不翻译会直接报
+# syntax error at or near "OR"（2026-10-31 新鲜 PG 库复现）。
+_OR_IGNORE_SELECT_RE = _re.compile(
+    r"^\s*INSERT\s+OR\s+IGNORE\s+INTO\s+(\w+)\s*"
+    r"(\([^)]*\))?\s+SELECT\s+(.*)$",
+    _re.IGNORECASE | _re.DOTALL)
 _INSERT_TABLE_RE = _re.compile(
     r"^\s*INSERT\s+INTO\s+(?:\w+\.)?(\w+)", _re.IGNORECASE)
 _PRAGMA_INFO_RE = _re.compile(
@@ -506,6 +522,22 @@ def _translate_sql(sql):
             "INSERT INTO %s (%s) VALUES (%s) ON CONFLICT DO NOTHING"
             % (table, cols, values))
         return _convert_placeholders(translated), "normal"
+    m = _OR_IGNORE_SELECT_RE.match(stripped)
+    if m:
+        # INSERT OR IGNORE ... SELECT 形 -> INSERT INTO ... SELECT
+        # ... ON CONFLICT DO NOTHING：与 VALUES 形同款语义（任何
+        # 唯一冲突都跳过、不改已有行）。旧版只认 VALUES 形，SELECT
+        # 形原样透传到 PG，直接报 syntax error at or near "OR"；
+        # 配额回填就是 SELECT 形，init_db 里它的 except 又把整个
+        # 事务 rollback，migrate 的 ALTER 一并被丢掉（见 server
+        # _backfill_default_quotas 的保存点注释）。
+        table = m.group(1)
+        cols = m.group(2) or ""
+        select_body = m.group(3).rstrip().rstrip(";")
+        translated = (
+            "INSERT INTO %s %s SELECT %s ON CONFLICT DO NOTHING"
+            % (table, cols, select_body))
+        return _convert_placeholders(translated), "normal"
     translated = _AUTOINCREMENT_RE.sub(
         "BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY", sql)
     translated = _convert_placeholders(translated)