* chore: Add the SPDX information to each file
Add copyright and licensing information as defined in version 3.0 of
the REUSE Specification.
* tweak format
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Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
* chore: remove default null
null is always the default value if a table column is nullable, and typeorm's
@Column only accepts strings for default.
* chore: synchronize code with database schema
* chore: sync generated migrations with code
