fix(postgres): read SSL config from nested DBeaver JSON properties

[hongweihao]

Problem

When using DBeaver's modern JSON config format (v21+), PostgreSQL connections configured with SSL fail with:

no pg_hba.conf entry for host "...", user "...", database "...", no encryption

even though SSL is correctly configured in DBeaver.

Root Cause

DBeaver's JSON config format stores driver-level properties under a nested properties key and the SSL handler config under handlers.postgre_ssl, rather than at the top level of the connection properties object:

{
  "configuration": {
    "url": "jdbc:postgresql://host:5432/mydb",
    "properties": {
      "sslmode": "require",
      "ssl": "true"
    },
    "handlers": {
      "postgre_ssl": {
        "enabled": true,
        "properties": { "sslMode": "require" }
      }
    }
  }
}

Both getPostgresSslConfig (in connection-pool.ts) and executePostgreSQLQuery (in dbeaver-client.ts) only read from the top-level properties.sslmode / properties.ssl, which are always undefined in this format. As a result, SSL mode falls back to the default or is treated as disabled, and the connection is sent without encryption — causing servers that require SSL (e.g. AWS RDS with hostssl in pg_hba.conf) to reject it.

Fix

Both SSL-reading locations now also check:

• properties.properties.sslmode / properties.properties.ssl — nested driver props
• properties.handlers.postgre_ssl.enabled + properties.handlers.postgre_ssl.properties.sslMode — DBeaver's SSL handler block

Testing

Verified against an AWS RDS PostgreSQL 15 instance configured with hostssl in pg_hba.conf. Before this fix, test_connection returned "no encryption" error. After the fix, the connection succeeds with SSL.

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