diff --git a/src/vahter-bot/migrations/V51__rawmessage_trgm_fastupdate_off.sql b/src/vahter-bot/migrations/V51__rawmessage_trgm_fastupdate_off.sql
new file mode 100644
index 0000000..2b07767
--- /dev/null
+++ b/src/vahter-bot/migrations/V51__rawmessage_trgm_fastupdate_off.sql
@@ -0,0 +1,8 @@
+-- idx_forensic_*: debug-session indexes, not read by bot code. GIN ones are built with fastupdate
+-- off, since a pending-list flush stalls the inserting webhook request for 10-30s on this tier.
+DROP INDEX CONCURRENTLY IF EXISTS idx_event_rawmessage_trgm;
+DROP INDEX CONCURRENTLY IF EXISTS idx_forensic_event_rawmessage_trgm;
+CREATE INDEX CONCURRENTLY idx_forensic_event_rawmessage_trgm
+  ON event USING gin ((data->>'rawMessage') gin_trgm_ops)
+  WITH (fastupdate = off)
+  WHERE event_type = 'MessageReceived';
diff --git a/src/vahter-bot/migrations/V52__mark_forensic_indexes.sql b/src/vahter-bot/migrations/V52__mark_forensic_indexes.sql
new file mode 100644
index 0000000..26249a7
--- /dev/null
+++ b/src/vahter-bot/migrations/V52__mark_forensic_indexes.sql
@@ -0,0 +1,8 @@
+-- Remaining debug-session indexes (V30, V38, V43, V48) get the idx_forensic_ prefix so the
+-- catalog itself shows which indexes no bot query depends on.
+ALTER INDEX IF EXISTS idx_event_username_lower           RENAME TO idx_forensic_event_username_lower;
+ALTER INDEX IF EXISTS idx_event_user_ban_by_stream       RENAME TO idx_forensic_event_user_ban_by_stream;
+ALTER INDEX IF EXISTS idx_event_mlscored_score_created_at RENAME TO idx_forensic_event_mlscored_score_created_at;
+ALTER INDEX IF EXISTS idx_snapshot_user_username         RENAME TO idx_forensic_snapshot_user_username;
+ALTER INDEX IF EXISTS idx_snapshot_user_banned           RENAME TO idx_forensic_snapshot_user_banned;
+ALTER INDEX IF EXISTS idx_snapshot_user_spam_protection  RENAME TO idx_forensic_snapshot_user_spam_protection;