chore: import upstream snapshot with attribution

bootstrap/sql/migrations/native/1.12.7/postgres/schemaChanges.sql

@@ -0,0 +1,32 @@
+-- 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.
+
+DROP INDEX CONCURRENTLY IF EXISTS idx_tag_usage_targetfqnhash_lower_pattern;
+CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_tag_usage_targetfqnhash_lower_pattern
+ON tag_usage (targetfqnhash_lower text_pattern_ops);
+
+DROP INDEX CONCURRENTLY IF EXISTS idx_tag_usage_tagfqn_lower_pattern;
+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);