fix(bridge): ignore pre-start trigger comments

bridge/bridge.py

@@ -37,6 +37,7 @@ import time
 import urllib.error
 import urllib.parse
 import urllib.request
+from datetime import datetime, timezone
 from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
 
 GITEA_API = os.environ.get("GITEA_API", "https://git.autonomic.zone/api/v1")
@@ -81,6 +82,7 @@ GITEA_TOKEN = _read(os.environ["GITEA_TOKEN_FILE"])
 # Shared dedup across the poll + webhook paths: a comment id triggers at most one run.
 _PROCESSED: set = set()
 _PROCESSED_LOCK = threading.Lock()
+_PROCESS_STARTED_AT = datetime.now(timezone.utc)
 
 
 def log(*a):
@@ -277,6 +279,23 @@ def _claim(comment_id) -> bool:
         return True
 
 
+def _is_preexisting_comment(comment) -> bool:
+    """Treat trigger comments older than this bridge process as already-seen.
+
+    This closes the reopened-PR hole where a PR was CLOSED during bridge startup, so its old
+    `!testme` comments were never marked seen by the first poll pass; when that PR is later reopened,
+    the poller must not replay those historical comments as fresh triggers.
+    """
+    created = (comment or {}).get("created_at")
+    if not created:
+        return False
+    try:
+        created_at = datetime.fromisoformat(created.replace("Z", "+00:00"))
+    except ValueError:
+        return False
+    return created_at <= _PROCESS_STARTED_AT
+
+
 def process_testme(full_name, owner, name, number, user, comment_id, source, quick=False):
     """Shared by both paths. Dedupes by comment id, checks authorization, resolves the PR head,
     triggers the build, comments the run link. Returns (run_url|None, reason)."""
@@ -389,7 +408,7 @@ def poll_loop():
                     if not is_trigger:
                         continue
                     cid = c.get("id")
-                    if first:
+                    if first or _is_preexisting_comment(c):
                         _claim(cid)  # mark pre-existing comments seen; don't fire on startup
                         continue
                     user = (c.get("user") or {}).get("login", "")