html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/sqlite-utils/issues/524#issuecomment-1422681850,https://api.github.com/repos/simonw/sqlite-utils/issues/524,1422681850,IC_kwDOCGYnMM5UzGb6,21095447,2023-02-08T14:25:50Z,2023-02-08T14:29:09Z,NONE,"I live the patch here for others:

_original code_
```shell
$ which sqlite-utils | xargs cat
```
```python
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import re
import sys
from sqlite_utils.cli import cli


if __name__ == '__main__':
    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
    sys.exit(cli())
```

_patched/sqlite-utils.py_
```python
#!/usr/bin/python3
# -*- coding: utf-8 -*-
import re
import sys
from sqlite_utils.cli import cli

# New imports
from unittest.mock import patch
from sqlite_utils.cli import VALID_COLUMN_TYPES


if __name__ == '__main__':
    # Choices of the option `--type`
    cli.commands['transform'].params[2].type.types[1].choices.append('DATETIME')

    # The dicts has to be extended with a new type
    with patch.dict('sqlite_utils.db.COLUMN_TYPE_MAPPING', {'DATETIME': 'DATETIME'}),\
         patch('sqlite_utils.cli.VALID_COLUMN_TYPES', VALID_COLUMN_TYPES + (""DATETIME"", )):

        # Command is unchanged
        sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
        sys.exit(cli())
```

And now it's working
```bash
$ sqlite-utils schema events.sqlite cards.chunk.get
CREATE TABLE ""cards.chunk.get"" (
   [id] INTEGER PRIMARY KEY NOT NULL,
   [timestamp] TEXT,
)

$ python patched/sqlite-utils.py transform events.sqlite cards.chunk.get --type timestamp DATETIME

$ sqlite-utils schema events.sqlite cards.chunk.get
CREATE TABLE ""cards.chunk.get"" (
   [id] INTEGER PRIMARY KEY NOT NULL,
   [timestamp] DATETIME,
)
```
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