fix: always reset validator offset on start (fixes wrong TLD resuming previous offset)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/validator.py

@@ -272,16 +272,16 @@ def start_validator(tld_filter: Optional[str] = None):
     global _val_task, _val_stats
     if _val_task and not _val_task.done():
         return  # already running
-    _val_stats["running"]    = True
-    _val_stats["tld_filter"] = tld_filter
-    # Only reset counters on a completely fresh start
-    if not _val_stats.get("processed"):
+    # Always reset for a fresh run — _filter_unvalidated skips already-done
+    # domains, so restarting from 0 is safe and fast even for the same TLD.
     _val_stats.update(
+        running=True,
         processed=0, live=0, dead=0, parked=0,
         redirect=0, skipped=0, offset=0, rate=0.0,
+        tld_filter=tld_filter,
     )
     _val_task = asyncio.create_task(_validator_loop(tld_filter))
-    logger.info("Validator started (tld=%s, offset=%d)", tld_filter, _val_stats["offset"])
+    logger.info("Validator started (tld=%s)", tld_filter)
 
 
 def stop_validator():