fix: enforce community cooldown per site

apps/api/tests/test_community_scheduler.py

@@ -1,7 +1,9 @@
 import pytest
 from pydantic import ValidationError
 
-from app.community_scheduler import MAX_BACKOFF_SECONDS, configured_sources, retry_delay
+from datetime import datetime, timedelta, timezone
+
+from app.community_scheduler import MAX_BACKOFF_SECONDS, configured_sources, oldest_site_source, retry_delay
 from app.config import Settings
 
 
@@ -19,3 +21,10 @@ def test_failed_runs_back_off_but_success_resets_delay() -> None:
     assert retry_delay(["failed", "failed", "failed"]) == 7200
     assert retry_delay(["failed"] * 20) == MAX_BACKOFF_SECONDS
     assert retry_delay(["success", "failed"]) == 1800
+
+
+def test_same_site_endpoints_rotate_by_oldest_attempt() -> None:
+    now = datetime.now(timezone.utc)
+    assert oldest_site_source("rf4stat-fishing", {}) == "rf4stat-fishing"
+    latest = {"rf4stat-fishing": now, "rf4stat-post": now - timedelta(hours=1)}
+    assert oldest_site_source("rf4stat-fishing", latest) == "rf4stat-post"