rehearsal: union task_attempts schema (main old DDL + gap-3 ledger cols), relax 2 hook no-table asserts to no-rows, gateway-env fake tolerates main routing reads, extend single-writer fixture list by name (test-only inserts)

cloud/attempt_ledger.py

@@ -168,11 +168,52 @@ OLD_TABLE_ALTER = (
 )
 
 
+def _existing_columns(conn, table):
+    """已有列集合（automations.py 同款口径：SQLite 走 PRAGMA，
+    其它后端异常时回空集、后续 ALTER 逐条 try/except 兜底）。"""
+    try:
+        return {row[1] for row in conn.execute(
+            "PRAGMA table_info(%s)" % table).fetchall()}
+    except Exception:
+        return set()
+
+
 def ensure_task_attempts_table(conn):
     """Create the ledger table if absent. Idempotent; does not
     touch existing rows. The caller owns the commit (``record_attempt``
-    commits; a bare ensure inside a larger transaction does not)."""
+    commits; a bare ensure inside a larger transaction does not).
+
+    演练注 FLAG（合入语义取舍点，主结论见演练报告）：
+    main 侧 init_db/worker 用 cloud.attempts.py 的旧 DDL 建同名
+    task_attempts 表（kind/interrupted_reason/checkpoint_round/
+    result_text/error_text，无 outcome 系列）；本模块的 CREATE
+    TABLE IF NOT EXISTS 在旧表已存在时是空操作，之后按台账
+    列写行即报 no column named outcome。本解法把表升级为两
+    组列的并集：旧表先建时补台账 4 列，台账表先建时补旧 5
+    列（新增列一律可空/带默认值，绝不对已有行加 NOT NULL，
+    否则旧行会挡住 ALTER）。两边读路径均按列名取数，互不
+    干扰；但这只是演练期保守解法——真合前须用户定：并集表、
+    台账改名、或统一 schema 三选一，不可悄悄定为并集表。
+    """
     conn.execute(SQLITE_DDL)
+    existing = _existing_columns(conn, "task_attempts")
+    for col, ddl in (
+            ("outcome", "TEXT"),
+            ("is_defect", "INTEGER DEFAULT 0"),
+            ("defect_category", "TEXT"),
+            ("corrects_attempt_no", "INTEGER"),
+            ("kind", "TEXT"),
+            ("interrupted_reason", "TEXT"),
+            ("checkpoint_round", "INTEGER"),
+            ("result_text", "TEXT"),
+            ("error_text", "TEXT")):
+        if col not in existing:
+            try:
+                conn.execute(
+                    "ALTER TABLE task_attempts ADD COLUMN %s %s"
+                    % (col, ddl))
+            except Exception:
+                pass
 
 
 def record_attempt(conn, task_id, outcome, is_defect=False,