FIX: Fix HTTP Error 500 for Snapshots Page

[zdomke]

Description

Fix the alembic versioning for changing the snapshot table column 'comment' --> 'description'.

Motivation

Closes #23

[zdomke]

Converting to draft to figure out alembic version naming scheme.

[zdomke]

For testing:

1. Bring down your existing backend & volumes
   docker compose down -v
2. Bring up the backend
   docker compose up -d --build
3. Upgrade the database with alembic
   docker exec squirrel-api alembic upgrade head
4. Check alembic version (should be '61476c608fc3')
   docker exec squirrel-api alembic current

[YektaY]

This works for me! thanks!

[shilorigins]

Trying to upgrade alembic without bringing down the volumes with -v, I got the following error:

INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Will assume transactional DDL.
ERROR [alembic.util.messaging] Can't locate revision identified by '003_perf_indexes'
FAILED: Can't locate revision identified by '003_perf_indexes'

After bringing down the volumes, the commands worked. However, since bringing down the volumes destroys all of their data, we should look into options for running upgrades that preserve db data.