Support AWS RDS IAM Authentication for PostgreSQL data soruce

[winebarrel]

What type of PR is this?

• Refactor
• Feature
• Bug Fix
• New Query Runner (Data Source)
• New Alert Destination
• Other

Description

Enable IAM authentication for connecting to AWS RDS in PostgreSQL data source.
see https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.IAMDBAuth.html

Using IAM authentication allows you to connect to the database more securely than with password authentication.

How is this tested?

• Unit tests (pytest, jest)
• E2E Tests (Cypress)
• Manually
• N/A

I added the following settings and confirmed that I could connect to the RDS for testing.

• .env

# NOTE: It is not a required environment variable.
AWS_ACCESS_KEY_ID=...
AWS_SECRET_ACCESS_KEY=...

postgres=> select * from pg_stat_activity where usename = 'iam_user';
-[ RECORD 1 ]----+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
datid            | 5
datname          | postgres
pid              | 1415
leader_pid       |
usesysid         | 16455
usename          | iam_user
application_name |
client_addr      | xxx.xxx.xxx.xxx
client_hostname  |
client_port      | 62581
backend_start    | 2026-04-18 02:40:21.920859+00
xact_start       | 2026-04-18 02:40:22.062642+00
query_start      | 2026-04-18 02:40:22.062642+00
state_change     | 2026-04-18 02:40:22.062644+00
wait_event_type  | Timeout
wait_event       | PgSleep
state            | active
backend_xid      |
backend_xmin     | 21736
query_id         | -2788934432199274759
query            | /* Username: admin@example.com, query_id: 1, Queue: queries, Job ID: a8dfe938-9655-4d8f-ae84-d44725de544e, Query Hash: 8f57b28d0702e12ca964e1136c4b5e0b, Scheduled: False */ select user, pg_sleep(30) LIMIT 1000
backend_type     | client backend

Related Tickets & Documents

• Support AWS RDS IAM Authentication for Redash database #7694
• Support AWS RDS IAM Authentication for PostgreSQL data source #7304

Mobile & Desktop Screenshots/Recordings (if there are UI changes)

[cubic-dev-ai]

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