archive invalid events and drop existing invalid postgres triggers

[tirumaraiselvan]

This is the backport of #6179 to master

[codingkarthik]

@tirumaraiselvan LGTM, but is there any way to test this?

[tirumaraiselvan]

This is the way I tested this:

1. create table test(id serial primary key, name text);
2. Create 2 event triggers:

{ "type": "replace_metadata",
  "args":
{
  "version": 2,
  "tables": [
    {
      "table": {
        "schema": "public",
        "name": "test"
      },
      "event_triggers": [
        {
          "name": "test_trigger",
          "definition": {
            "enable_manual": false,
            "insert": {
              "columns": "*"
            }
          },
          "retry_conf": {
            "num_retries": 0,
            "interval_sec": 10,
            "timeout_sec": 60
          },
          "webhook": "http://httpbin.org/post"
        },
        {
          "name": "test_trigger2",
          "definition": {
            "enable_manual": false,
            "insert": {
              "columns": "*"
            }
          },
          "retry_conf": {
            "num_retries": 0,
            "interval_sec": 10,
            "timeout_sec": 60
          },
          "webhook": "http://httpbin.org/post"
        }
      ]
    }
  ]
}
}

3. Drop one of the event triggers:

{ "type": "replace_metadata",
  "args":
{
  "version": 2,
  "tables": [
    {
      "table": {
        "schema": "public",
        "name": "test"
      },
      "event_triggers":[
        {
          "name": "test_trigger2",
          "definition": {
            "enable_manual": false,
            "insert": {
              "columns": "*"
            }
          },
          "retry_conf": {
            "num_retries": 0,
            "interval_sec": 10,
            "timeout_sec": 60
          },
          "webhook": "http://httpbin.org/post"
        }
      ]
    }
  ]
}
}

4. insert into test, 2 events will be created (one for valid event trigger, one for deleted event trigger): "table or event-trigger not found in schema cache" error in logs #5461
5. Upgrade with the fix in this PR
6. Notice that the invalid event is now archived

[jberryman]

Suggested change

	-- this clears pre-existing invalid triggers
	-- this clears pre-existing invalid triggers
	-- See https://github.com/hasura/graphql-engine/pull/6137

[jberryman]

Just that comment for helpful context

[hasura-bot]

Thanks for your contribution! Your changes have been merged successfully.