Stamp alembic head when recreating tables

[evroon]

fix #520

After initializing the database, we don't want/need to run any migrations, so we just tell alembic we're on the latest revision.

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Name	Status	Preview	Comments	Updated (UTC)
bracket	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 24, 2024 11:27am

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 90.23%. Comparing base (d016e50) to head (3aa7f61).

Files	Patch %	Lines
backend/bracket/utils/alembic.py	81.81%	2 Missing ⚠️
backend/bracket/app.py	50.00%	1 Missing ⚠️
backend/bracket/utils/db_init.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #521      +/-   ##
==========================================
- Coverage   92.36%   90.23%   -2.13%     
==========================================
  Files         106      121      +15     
  Lines        3639     3880     +241     
==========================================
+ Hits         3361     3501     +140     
- Misses        278      379     +101     

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[evroon]

When I delete the alembic_version table, and then run ./cli.py create-dev-db, it successfully creates the alembic_version table, sets the head revision, and the tool runs normally without running migrations.