Fix segfault when setting chunk replica identity

The problem occurs because `currentEventTriggerState->currentCommand`
is not set up since `AlterTableInternal` is called without calling
`EventTriggerAlterTableStart`.

This is because `AlterTableInternal` is called as part of a different
statement, which do not "prepare" for an `AlterTable` correctly.

Fixed it by properly adding the proper start and end calls for the event
trigger on the underlying `AlterTable` to set the replica identity for a
new created chunk introduced by #5515.

Fixes #7406

src/chunk.c

@@ -900,7 +900,9 @@ chunk_set_replica_identity(const Chunk *chunk)
 	}
 
 	ts_catalog_database_info_become_owner(ts_catalog_database_info_get(), &sec_ctx);
+	EventTriggerAlterTableStart((Node *) &cmd);
 	AlterTableInternal(chunk->table_id, list_make1(&cmd), false);
+	EventTriggerAlterTableEnd();
 	ts_catalog_restore_user(&sec_ctx);
 	table_close(ht_rel, NoLock);
 }

test/expected/create_chunks.out

@@ -221,3 +221,48 @@ ERROR:  invalid interval: an explicit interval must be specified
 SELECT set_chunk_time_interval('chunk_test2', NULL::INTERVAL);
 ERROR:  invalid interval: an explicit interval must be specified
 \set ON_ERROR_STOP 1
+-- Issue https://github.com/timescale/timescaledb/issues/7406
+CREATE TABLE test_ht (time TIMESTAMPTZ, v1 INTEGER);
+SELECT create_hypertable('test_ht', by_range('time', INTERVAL '1 hour'));
+NOTICE:  adding not-null constraint to column "time"
+ create_hypertable 
+-------------------
+ (4,t)
+(1 row)
+
+CREATE TABLE test_tb (time TIMESTAMPTZ, v1 INTEGER);
+CREATE OR REPLACE FUNCTION test_tb_trg_insert() RETURNS TRIGGER AS $$
+BEGIN
+  INSERT INTO test_ht VALUES (NEW.time, NEW.v1);
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+CREATE TRIGGER test_tb_trg_insert AFTER
+INSERT ON test_tb
+FOR EACH ROW EXECUTE FUNCTION test_tb_trg_insert();
+CREATE TABLE test_output AS
+WITH rows AS (
+  SELECT t, 1 FROM generate_series(NOW()-interval '1 day', NOW(), interval '1 hour') AS t
+), inserted AS (
+  INSERT INTO test_tb SELECT * FROM rows RETURNING *
+)
+SELECT * FROM inserted;
+-- All tables should have the same number of rows
+SELECT count(*) FROM test_tb;
+ count 
+-------
+    25
+(1 row)
+
+SELECT count(*) FROM test_ht;
+ count 
+-------
+    25
+(1 row)
+
+SELECT count(*) FROM test_output;
+ count 
+-------
+    25
+(1 row)
+

test/sql/create_chunks.sql

@@ -121,3 +121,32 @@ SELECT set_chunk_time_interval('chunk_test', NULL::BIGINT);
 SELECT set_chunk_time_interval('chunk_test2', NULL::BIGINT);
 SELECT set_chunk_time_interval('chunk_test2', NULL::INTERVAL);
 \set ON_ERROR_STOP 1
+
+-- Issue https://github.com/timescale/timescaledb/issues/7406
+CREATE TABLE test_ht (time TIMESTAMPTZ, v1 INTEGER);
+SELECT create_hypertable('test_ht', by_range('time', INTERVAL '1 hour'));
+CREATE TABLE test_tb (time TIMESTAMPTZ, v1 INTEGER);
+
+CREATE OR REPLACE FUNCTION test_tb_trg_insert() RETURNS TRIGGER AS $$
+BEGIN
+  INSERT INTO test_ht VALUES (NEW.time, NEW.v1);
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER test_tb_trg_insert AFTER
+INSERT ON test_tb
+FOR EACH ROW EXECUTE FUNCTION test_tb_trg_insert();
+
+CREATE TABLE test_output AS
+WITH rows AS (
+  SELECT t, 1 FROM generate_series(NOW()-interval '1 day', NOW(), interval '1 hour') AS t
+), inserted AS (
+  INSERT INTO test_tb SELECT * FROM rows RETURNING *
+)
+SELECT * FROM inserted;
+
+-- All tables should have the same number of rows
+SELECT count(*) FROM test_tb;
+SELECT count(*) FROM test_ht;
+SELECT count(*) FROM test_output;