Add support for PostgreSQL keywords in CREATE CONSTRAINT TRIGGER (#948)

Config:

```js
language: 'postgresql',
keywordCase: 'upper',
identifierCase: 'lower',
```

Before:

```sql
CREATE CONSTRAINT TRIGGER example_trigger
AFTER insert
OR
UPDATE of column_a,
column_b ON example_table DEFERRABLE INITIALLY deferred FOR each ROW
EXECUTE procedure example_function ();

CREATE TRIGGER example_trigger
AFTER insert
OR
UPDATE
OR delete ON example_table FOR each ROW
EXECUTE function example_function ();
```

After:

```sql
CREATE CONSTRAINT TRIGGER example_trigger
AFTER INSERT OR UPDATE OF column_a,
column_b ON example_table
DEFERRABLE INITIALLY DEFERRED FOR EACH ROW
EXECUTE PROCEDURE example_function ();

CREATE TRIGGER example_trigger
AFTER INSERT OR UPDATE OR DELETE ON example_table FOR EACH ROW
EXECUTE FUNCTION example_function ();
```

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* PostgreSQL formatting now recognizes additional reserved multi-word
phrases and variants (improves handling of trigger/constraint event
clauses, EXECUTE forms, AFTER/DEFERRABLE variants, and FOR EACH ROW) for
more accurate SQL output.

* **Tests**
* Added regression tests verifying CREATE CONSTRAINT/TRIGGER formatting
and correct casing preservation for keywords and identifiers.

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Author: nene

src/languages/postgresql/postgresql.formatter.ts

@@ -62,7 +62,10 @@ const tabularOnelineClauses = expandPhrases([
   'TRUNCATE [TABLE] [ONLY]',
   // other
   'SET SCHEMA',
-  'AFTER',
+  '{BEFORE | AFTER | INSTEAD OF} {INSERT | UPDATE [OF] | DELETE | TRUNCATE}',
+  '[NOT] DEFERRABLE',
+  'INITIALLY {DEFERRED | IMMEDIATE}',
+  '[NOT] DEFERRABLE INITIALLY {DEFERRED | IMMEDIATE}',
   // https://www.postgresql.org/docs/14/sql-commands.html
   'ABORT',
   'ALTER AGGREGATE',
@@ -200,7 +203,7 @@ const tabularOnelineClauses = expandPhrases([
   'DROP USER',
   'DROP USER MAPPING',
   'DROP VIEW',
-  'EXECUTE',
+  'EXECUTE [FUNCTION | PROCEDURE]',
   'EXPLAIN',
   'FETCH',
   'GRANT',
@@ -255,6 +258,8 @@ const reservedKeywordPhrases = expandPhrases([
   'ON {UPDATE | DELETE} [NO ACTION | RESTRICT | CASCADE | SET NULL | SET DEFAULT]',
   'DO {NOTHING | UPDATE}',
   'AS MATERIALIZED',
+  'FOR EACH ROW',
+  'OR {INSERT | UPDATE [OF] | DELETE | TRUNCATE}',
   '{ROWS | RANGE | GROUPS} BETWEEN',
   // comparison operator
   'IS [NOT] DISTINCT FROM',

test/postgresql.test.ts

@@ -258,4 +258,41 @@ describe('PostgreSqlFormatter', () => {
       dedent`COMMENT ON TABLE foo IS 'Hello my table';`
     );
   });
+
+  it('formats keywords in CREATE CONSTRAINT TRIGGER', () => {
+    expect(
+      format(
+        `create constraint trigger Example_Trigger
+        after insert
+        or
+        update of Column_A,
+        Column_B on Example_Table
+        deferrable initially deferred for each row
+        execute procedure Example_Function ();`,
+        { keywordCase: 'upper', identifierCase: 'lower' }
+      )
+    ).toBe(dedent`
+      CREATE CONSTRAINT TRIGGER example_trigger
+      AFTER INSERT OR UPDATE OF column_a,
+      column_b ON example_table
+      DEFERRABLE INITIALLY DEFERRED FOR EACH ROW
+      EXECUTE PROCEDURE example_function ();
+    `);
+  });
+
+  it('formats multiple CREATE TRIGGER events without treating OR as a logical operator', () => {
+    expect(
+      format(
+        `create trigger Example_Trigger
+        after insert or update or delete on Example_Table
+        for each row
+        execute function Example_Function ();`,
+        { keywordCase: 'upper', identifierCase: 'lower' }
+      )
+    ).toBe(dedent`
+      CREATE TRIGGER example_trigger
+      AFTER INSERT OR UPDATE OR DELETE ON example_table FOR EACH ROW
+      EXECUTE FUNCTION example_function ();
+    `);
+  });
 });