chore: import upstream snapshot with attribution

bootstrap/sql/migrations/native/1.12.12/postgres/schemaChanges.sql

@@ -0,0 +1,16 @@
+-- Widen tag_usage.tagFQN (was VARCHAR(256)) toward the fullyQualifiedEntityName contract (max 3072).
+-- Entity names allow up to 256 chars and nested glossary terms concatenate, so a tag FQN routinely
+-- exceeds 256 -- which made applyTag inserts and glossaryTerm moveAsync renames fail with
+-- "value too long for type character varying(256)". tagFQN feeds the tagfqn_lower generated column,
+-- which Postgres will not let us re-type in place, so drop it (cascading its two text_pattern_ops
+-- indexes), widen tagFQN, then recreate the column and those indexes unchanged. 512 keeps the column
+-- within MySQL InnoDB's 3072-byte key limit for the full-tagFQN idx_tag_usage_target_source index.
+ALTER TABLE tag_usage DROP COLUMN IF EXISTS tagfqn_lower;
+ALTER TABLE tag_usage ALTER COLUMN tagFQN TYPE VARCHAR(512);
+ALTER TABLE tag_usage ADD COLUMN tagfqn_lower text GENERATED ALWAYS AS (lower(tagFQN)) STORED;
+ALTER TABLE tag_usage ALTER COLUMN tagfqn_lower SET STATISTICS 500;
+CREATE INDEX IF NOT EXISTS idx_tag_usage_tagfqn_lower_pattern
+    ON tag_usage (tagfqn_lower text_pattern_ops);
+CREATE INDEX IF NOT EXISTS idx_tag_usage_tagfqn_prefix_covering
+    ON tag_usage (source, tagfqn_lower text_pattern_ops)
+    INCLUDE (targetFQNHash, labelType, state);