Validate database parameter usage in Elixir Postgrex connection example

[coderabbitai]

Context

In PR #408, the Elixir connection example uses:

{:ok, pid} = Postgrex.start_link(hostname: "localhost", username: "crate", password: "crate", database: "")

Issue

CrateDB has no notion of databases like PostgreSQL does. Instead, CrateDB uses schemas to separate concerns. Setting the database parameter (even to an empty string) might cause connection issues or unexpected behavior.

Task

Validate whether:

1. The database parameter should be omitted entirely from the Postgrex connection options
2. Or if it should be set to a specific value
3. Document the correct approach in the Elixir connection example

References

• PR: Driver: Add page about Elixir #408
• Comment: Driver: Add page about Elixir #408 (comment)
• Requested by: @amotl

[amotl]

This patch applied maintenance on the Elixir code, so we guess everything will be in order.

• Driver: Add page about Elixir #408