Function ParseConnectionString

Parse a JSON connection string (passed as apiKey) into a config object. Falls back to environment-variable defaults for any missing fields.

Accepted JSON shape:

{
  "host": "localhost",
  "port": 5432,
  "database": "vectors",
  "user": "postgres",
  "password": "secret",
  "schema": "public",
  "ssl": false
}
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