Add docs for database migration naming conventions and rollback process

[Chucks1093]

Summary
Database migrations lack a documented naming convention and the rollback process is not described anywhere. Contributors adding migrations need to know the naming rules and how to safely roll back a migration in development and production.

Scope

• document the naming convention for migration files including the timestamp and description format
• describe the rollback process for development and production environments
• note any migrations that are considered irreversible and why

Acceptance Criteria

• the migration naming convention is documented with an example
• the rollback process is described for both environments
• no code changes are required; this is a docs-only issue

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[Chidubemkingsley]

@Chidubemkingsley has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

will like to work on this

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[wavyboy-build]

@wavyboy-build has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Pls assign me this issue

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[shadrach68]

@shadrach68 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

please assign this issue to me

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[drips-wave]

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