diff --git a/bootstrap/sql/migrations/native/1.12.7/postgres/schemaChanges.sql b/bootstrap/sql/migrations/native/1.12.7/postgres/schemaChanges.sql
index 99bc7b7ff037..e920bd3c46c8 100644
--- a/bootstrap/sql/migrations/native/1.12.7/postgres/schemaChanges.sql
+++ b/bootstrap/sql/migrations/native/1.12.7/postgres/schemaChanges.sql
@@ -9,3 +9,34 @@ CREATE INDEX IF NOT EXISTS idx_entity_extension_version_order
 CREATE INDEX IF NOT EXISTS idx_entity_extension_changed_field_keys
   ON entity_extension USING GIN (changedFieldKeys)
   WHERE changedFieldKeys IS NOT NULL;
+
+-- Issue #27158: tag_usage seq-scan on Postgres. #24063 dropped the
+-- `state = 1` predicate that 1.11.0's partial indexes required.
+-- Fix: add single-col indexes on the `_lower` columns, and drop the
+-- `WHERE state = 1` filter from the partials so changes can't invalidate them.
+
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tag_usage_targetfqnhash_lower_pattern
+ON tag_usage (targetfqnhash_lower text_pattern_ops);
+
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tag_usage_tagfqn_lower_pattern
+ON tag_usage (tagfqn_lower text_pattern_ops);
+
+DROP INDEX CONCURRENTLY IF EXISTS idx_tag_usage_target_prefix_covering;
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tag_usage_target_prefix_covering
+ON tag_usage (source, targetfqnhash_lower text_pattern_ops)
+INCLUDE (tagFQN, labelType, state);
+
+DROP INDEX CONCURRENTLY IF EXISTS idx_tag_usage_tagfqn_prefix_covering;
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tag_usage_tagfqn_prefix_covering
+ON tag_usage (source, tagfqn_lower text_pattern_ops)
+INCLUDE (targetFQNHash, labelType, state);
+
+DROP INDEX CONCURRENTLY IF EXISTS idx_tag_usage_join_source;
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tag_usage_join_source
+ON tag_usage (tagFQNHash, source)
+INCLUDE (targetFQNHash, tagFQN, labelType, state);
+
+CREATE EXTENSION IF NOT EXISTS pg_trgm;
+DROP INDEX CONCURRENTLY IF EXISTS gin_tag_usage_targetfqn_trgm;
+CREATE INDEX CONCURRENTLY IF NOT EXISTS gin_tag_usage_targetfqn_trgm
+ON tag_usage USING GIN (targetFQNHash gin_trgm_ops);