Replace legacy custom db migration system with alembic

[cmyui]

Describe your changes

Related Issues / Projects

Checklist

• I've manually tested my code

[cmyui]

Need to undo this/move it to be alembic-specific; we want aiomysql at runtime

[cmyui]

Diffs observed from generating the base schema

INFO  [alembic.autogenerate.compare] Detected removed table 'relationships'
INFO  [alembic.autogenerate.compare] Detected removed table 'startups'
INFO  [alembic.autogenerate.compare] Detected removed index 'nmapsets_id_uindex' on 'mapsets'
INFO  [alembic.autogenerate.compare] Detected removed table 'mapsets'
INFO  [alembic.autogenerate.compare] Detected removed table 'performance_reports'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=128) to String(length=128, collation='utf8') on 'achievements.name'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=256) to String(length=256, collation='utf8') on 'achievements.desc'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=16) to String(length=16, collation='utf8') on 'clans.name'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=6) to String(length=6, collation='utf8') on 'clans.tag'
INFO  [alembic.autogenerate.compare] Detected changed index 'clans_name_uindex' on 'clans': unique=True to unique=False
INFO  [alembic.autogenerate.compare] Column 'comments.target_id' has no type within the model; can't compare
INFO  [alembic.autogenerate.compare] Detected column comment 'comments.target_id'
INFO  [alembic.autogenerate.compare] Detected type change from ENUM('replay', 'map', 'song') to Enum('REPLAY', 'BEATMAP', 'SONG', name='target_type') on 'comments.target_type'
INFO  [alembic.autogenerate.compare] Detected type change from INTEGER() to FLOAT(precision=6, scale=3) on 'comments.time'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=80) to String(length=80, collation='utf8') on 'comments.comment'
INFO  [alembic.autogenerate.compare] Detected column comment 'comments.colour'
INFO  [alembic.autogenerate.compare] Detected column comment 'ingame_logins.ip'
INFO  [alembic.autogenerate.compare] Detected column comment 'logs.from'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=2048) to String(length=2048, collation='utf8') on 'logs.msg'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=2048) to String(length=2048, collation='utf8') on 'mail.msg'
INFO  [alembic.autogenerate.compare] Detected type change from ENUM('osu!', 'private') to Enum('OSU', 'PRIVATE', name='server') on 'maps.server'
INFO  [alembic.autogenerate.compare] Detected type change from CHAR(length=32) to String(length=32) on 'maps.md5'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=128) to String(length=128, collation='utf8') on 'maps.artist'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=128) to String(length=128, collation='utf8') on 'maps.title'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=128) to String(length=128, collation='utf8') on 'maps.version'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=19) to String(length=19, collation='utf8') on 'maps.creator'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=256) to String(length=256, collation='utf8') on 'maps.filename'
INFO  [alembic.autogenerate.compare] Detected type change from CHAR(length=32) to String(length=32) on 'ratings.map_md5'
INFO  [alembic.autogenerate.compare] Detected type change from BIGINT(unsigned=True) to Integer() on 'scores.id'
INFO  [alembic.autogenerate.compare] Detected type change from CHAR(length=32) to String(length=32) on 'scores.map_md5'
INFO  [alembic.autogenerate.compare] Detected type change from FLOAT(precision=7, scale=3) to FLOAT(precision=6, scale=3) on 'scores.pp'
INFO  [alembic.autogenerate.compare] Detected type change from TINYINT() to Integer() on 'scores.status'
INFO  [alembic.autogenerate.compare] Detected type change from TINYINT() to Integer() on 'scores.mode'
INFO  [alembic.autogenerate.compare] Detected type change from CHAR(length=32) to String(length=32) on 'scores.online_checksum'
INFO  [alembic.autogenerate.compare] Detected type change from BIGINT(unsigned=True) to Integer() on 'stats.tscore'
INFO  [alembic.autogenerate.compare] Detected type change from BIGINT(unsigned=True) to Integer() on 'stats.rscore'
INFO  [alembic.autogenerate.compare] Detected type change from BIGINT() to Integer() on 'tourney_pool_maps.mods'
INFO  [alembic.autogenerate.compare] Detected type change from TINYINT() to Integer() on 'tourney_pool_maps.slot'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(length=64) to String(length=16) on 'tourney_pools.name'
INFO  [alembic.autogenerate.compare] Detected type change from MEDIUMTEXT() to String(length=32, collation='utf8') on 'users.name'
INFO  [alembic.autogenerate.compare] Detected type change from MEDIUMTEXT() to String(length=32, collation='utf8') on 'users.safe_name'
INFO  [alembic.autogenerate.compare] Detected type change from CHAR(length=60) to String(length=60) on 'users.pw_bcrypt'
INFO  [alembic.autogenerate.compare] Detected type change from CHAR(length=2) to String(length=2) on 'users.country'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=16) to String(length=16, collation='utf8') on 'users.custom_badge_name'
INFO  [alembic.autogenerate.compare] Detected type change from VARCHAR(charset='utf8mb3', collation='utf8mb3_general_ci', length=2048) to String(length=2048, collation='utf8') on 'users.userpage_content'
INFO  [alembic.autogenerate.compare] Detected type change from CHAR(length=36) to String(length=36) on 'users.api_key'
INFO  [alembic.autogenerate.compare] Detected removed index 'users_irc_key_uindex' on 'users'
INFO  [alembic.autogenerate.compare] Detected added index ''users_name_uindex'' on '('name',)'
INFO  [alembic.autogenerate.compare] Detected added index ''users_safe_name_uindex'' on '('safe_name',)'
INFO  [alembic.autogenerate.compare] Detected removed column 'users.irc_key'

(This is basically the todo list for this pr)

[cmyui]

I wonder if we can set this up to just defer to logging.yaml

[cmyui]

I wonder if we could use pre-commit hooks here? We could probably call into quite a few of them directly if we really had to. Maybe we'll find it's not worth using this & pre-commit after the fact is ok

[cmyui]

TODO: this is still missing the existing seed data, as well as a couple of the tables that already exist (we should really have a 1:1 representation of the existing db in this PR, so that it gives us the ability to use alembic to remove those existing parts of the schema in future PRs -- otherwise we'll have a desync between user's db states & where alembic thinks they are).

[cmyui]

Also now missing index from #642

[NiceAesth]

this would be epic to get in