fix: reapply lost PR #357 — remove stale miner_tier_stats ref, lower MIN_CREDIBILITY to 0.80

PR #357 was merged into test but lost twice due to rebase force-pushes.
Re-applies: remove CLEANUP_STALE_MINER_TIER_STATS_BY_HOTKEY (table gone),
lower MIN_CREDIBILITY 0.90 → 0.80, fix test assertions with proper None checks.

Author: anderdc

gittensor/constants.py

@@ -104,7 +104,7 @@
 # Eligibility Gate (OSS Contributions)
 # =============================================================================
 MIN_VALID_MERGED_PRS = 5  # minimum "valid" merged PRs (token_score >= MIN_TOKEN_SCORE_FOR_BASE_SCORE) to receive score
-MIN_CREDIBILITY = 0.90  # minimum credibility ratio to receive score
+MIN_CREDIBILITY = 0.80  # minimum credibility ratio to receive score
 CREDIBILITY_MULLIGAN_COUNT = 1  # number of closed PRs forgiven (erased from merged+closed counts entirely)
 
 # =============================================================================

gittensor/validator/storage/queries.py

@@ -25,13 +25,6 @@
   AND created_at <= %s
 """
 
-CLEANUP_STALE_MINER_TIER_STATS_BY_HOTKEY = """
-DELETE FROM miner_tier_stats
-WHERE uid = %s AND hotkey = %s
-  AND github_id != %s
-  AND github_id != '0'
-"""
-
 CLEANUP_STALE_MINERS_BY_HOTKEY = """
 DELETE FROM miners
 WHERE uid = %s AND hotkey = %s

gittensor/validator/storage/repository.py

@@ -21,7 +21,6 @@
     BULK_UPSERT_PULL_REQUESTS,
     CLEANUP_STALE_MINER_EVALUATIONS,
     CLEANUP_STALE_MINER_EVALUATIONS_BY_HOTKEY,
-    CLEANUP_STALE_MINER_TIER_STATS_BY_HOTKEY,
     CLEANUP_STALE_MINERS,
     CLEANUP_STALE_MINERS_BY_HOTKEY,
     SET_MINER,
@@ -134,7 +133,6 @@ def cleanup_stale_miner_data(self, evaluation: MinerEvaluation) -> None:
         reverse_params = (evaluation.uid, evaluation.hotkey, evaluation.github_id)
         reverse_eval_params = reverse_params + (evaluation.evaluation_timestamp,)
         self.execute_command(CLEANUP_STALE_MINER_EVALUATIONS_BY_HOTKEY, reverse_eval_params)
-        self.execute_command(CLEANUP_STALE_MINER_TIER_STATS_BY_HOTKEY, reverse_params)
         self.execute_command(CLEANUP_STALE_MINERS_BY_HOTKEY, reverse_params)
 
     def store_pull_requests_bulk(self, pull_requests: List[PullRequest]) -> int:

tests/validator/test_pat_handler.py

@@ -150,7 +150,8 @@ def test_github_identity_change_rejected(self, mock_validate, mock_test_query, m
         assert 'locked' in (result.rejection_reason or '').lower()
 
         # Original entry should be unchanged
-        entry = pat_storage.get_pat_by_uid(1) or {}
+        entry = pat_storage.get_pat_by_uid(1)
+        assert entry is not None
         assert entry['github_id'] == 'github_42'
 
     @patch('gittensor.validator.pat_handler._test_pat_against_repo', return_value=None)
@@ -163,7 +164,8 @@ def test_pat_rotation_same_github_accepted(self, mock_validate, mock_test_query,
         result = _run(handle_pat_broadcast(mock_validator, synapse))
 
         assert result.accepted is True
-        entry = pat_storage.get_pat_by_uid(1) or {}
+        entry = pat_storage.get_pat_by_uid(1)
+        assert entry is not None
         assert entry['pat'] == 'ghp_refreshed'
         assert entry['github_id'] == 'github_42'
 
@@ -177,7 +179,8 @@ def test_new_miner_on_uid_can_use_any_github(self, mock_validate, mock_test_quer
         result = _run(handle_pat_broadcast(mock_validator, synapse))
 
         assert result.accepted is True
-        entry = pat_storage.get_pat_by_uid(1) or {}
+        entry = pat_storage.get_pat_by_uid(1)
+        assert entry is not None
         assert entry['github_id'] == 'github_99'
         assert entry['hotkey'] == 'hotkey_1'