fix: initialise realtime schema on db start

[sweatybridge]

What kind of change does this PR introduce?

Bug fix

What is the new behavior?

Allows realtime channels to be setup via seed.sql.
Allows RLS on realtime schema to be added via migrations.

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 8704193483

Details

• 48 of 52 (92.31%) changed or added relevant lines in 2 files are covered.
• 7 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.08%) to 57.91%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/db/start/start.go	46	50	92.0%

Files with Coverage Reduction	New Missed Lines	%
internal/db/start/start.go	2	88.61%
internal/gen/keys/keys.go	5	11.76%

Totals
Change from base Build 8702197731:	0.08%
Covered Lines:	6439
Relevant Lines:	11119

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💛 - Coveralls