git-update: Avoid duplicate notifications

Fixes FS#45254.
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

git-interface/git-update.py

@@ -144,8 +144,12 @@ def save_srcinfo(srcinfo, db, cur, user):
 
     # Add user to notification list on adoption.
     if was_orphan:
-        cur.execute("INSERT INTO CommentNotify (PackageBaseID, UserID) " +
-                    "VALUES (%s, %s)", [pkgbase_id, user_id])
+        cur.execute("SELECT COUNT(*) FROM CommentNotify WHERE " +
+                    "PackageBaseID = %s AND UserID = %s",
+                    [pkgbase_id, user_id])
+        if cur.fetchone()[0] == 0:
+            cur.execute("INSERT INTO CommentNotify (PackageBaseID, UserID) " +
+                        "VALUES (%s, %s)", [pkgbase_id, user_id])
 
     db.commit()