Fix dashboard query

[xcrone]

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• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Related Issues

Fixes #

[iazaran]

Thanks @xcrone ,

Requesting changes because this fixes one SQL portability issue but introduces another one.

• The stats() change from status = "error" to status = 'error' is correct. Single quotes are the right SQL string literal syntax, and this helps PostgreSQL compatibility 👍
• The http_calls::text / mail_calls::text change is not good idea. ::text is PostgreSQL-specific syntax. This package should remain portable across supported Laravel databases. It can also break MySQL users. Since http_calls and mail_calls are JSON columns, we should use a database-portable approach instead, preferably Laravel JSON helpers like whereJsonLength(...), or a driver-aware expression.
• Please also add a regression test covering null, empty JSON arrays, and non-empty arrays for http_calls and mail_calls, so we know the dashboard operation counts work across databases.

[iazaran]

Because of long waiting, we are going to make a PR separately to improve queries.