Clarify Alembic migration variable usage in response to review feedback

[Copilot]

Review feedback flagged the revision variable in the Alembic migration file as unused. These module-level variables (revision, down_revision, branch_labels, depends_on) are required by Alembic's migration framework and accessed via introspection.

Context

Static analysis tools may flag these as unused since they're not directly referenced in code, but they're essential for Alembic to:

• Track migration chain order
• Resolve migration dependencies
• Enable upgrade/downgrade operations

Current State

The migration file follows standard Alembic structure from script.py.mako:

# revision identifiers, used by Alembic.
revision: str = '001'
down_revision: Union[str, None] = None
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None

Removing these would break the migration system. Awaiting clarification on desired changes - if the concern is linter warnings, configuration updates may be more appropriate than code changes.

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