fix: backfill meta update - handle existing rows with NOT NULL last_agg_id

backend/backfill_agg_trades.py

@@ -112,13 +112,20 @@ def get_earliest_agg_id(conn: sqlite3.Connection, symbol: str) -> int | None:
 
 
 def update_earliest_meta(conn: sqlite3.Connection, symbol: str, agg_id: int, time_ms: int):
-    conn.execute("""
-        INSERT INTO agg_trades_meta (symbol, earliest_agg_id, earliest_time_ms)
-        VALUES (?, ?, ?)
-        ON CONFLICT(symbol) DO UPDATE SET
-            earliest_agg_id = MIN(excluded.earliest_agg_id, COALESCE(agg_trades_meta.earliest_agg_id, excluded.earliest_agg_id)),
-            earliest_time_ms = MIN(excluded.earliest_time_ms, COALESCE(agg_trades_meta.earliest_time_ms, excluded.earliest_time_ms))
-    """, (symbol, agg_id, time_ms))
+    # 先检查是否已有该symbol的记录
+    row = conn.execute("SELECT symbol FROM agg_trades_meta WHERE symbol = ?", (symbol,)).fetchone()
+    if row:
+        conn.execute("""
+            UPDATE agg_trades_meta SET
+                earliest_agg_id = MIN(?, COALESCE(earliest_agg_id, ?)),
+                earliest_time_ms = MIN(?, COALESCE(earliest_time_ms, ?))
+            WHERE symbol = ?
+        """, (agg_id, agg_id, time_ms, time_ms, symbol))
+    else:
+        conn.execute("""
+            INSERT INTO agg_trades_meta (symbol, last_agg_id, last_time_ms, earliest_agg_id, earliest_time_ms)
+            VALUES (?, ?, ?, ?, ?)
+        """, (symbol, agg_id, time_ms, agg_id, time_ms))
     conn.commit()