fix: keep the postgres backfill from disabling telemetry or locking the table

src/polygateway/telemetry/sqlite.py

@@ -104,15 +104,20 @@ class SQLiteRecorder:
             return
         try:
             existing = {row[1] for row in self._conn.execute("PRAGMA table_info(llm_calls)")}
-            for column, decl in _BACKFILL_COLUMNS:
-                if column in existing:
-                    continue
-                self._conn.execute(f"ALTER TABLE llm_calls ADD COLUMN {column} {decl}")
-            self._conn.commit()
         except sqlite3.Error as exc:
-            # duplicate column: 多进程共库时后到者必然撞上,属预期竞态,视为成功
-            if "duplicate column" not in str(exc).lower():
-                logger.warning("SQLite 遥测补列失败(写入将逐行降级): {}", exc)
+            logger.warning("SQLite 遥测列探测失败(写入将逐行降级): {}", exc)
+            return
+        for column, decl in _BACKFILL_COLUMNS:
+            if column in existing:
+                continue
+            # 逐列独立 try: 一列撞上 duplicate 不得让后面的列漏补
+            try:
+                self._conn.execute(f"ALTER TABLE llm_calls ADD COLUMN {column} {decl}")
+                self._conn.commit()
+            except sqlite3.Error as exc:
+                # duplicate column: 多进程共库时后到者必然撞上,属预期竞态,视为成功
+                if "duplicate column" not in str(exc).lower():
+                    logger.warning("SQLite 遥测补列失败(写入将逐行降级): {}", exc)
 
     async def record_llm_call(self, **fields: object) -> None:
         """写一行遥测;字段集合即 20 字段冻结签名(ports.TelemetryRecorder)。"""