id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
638212085,MDU6SXNzdWU2MzgyMTIwODU=,842,Magic parameters for canned queries,9599,closed,0,,5533512,18,2020-06-13T18:50:08Z,2020-06-28T03:30:31Z,2020-06-28T02:58:18Z,OWNER,,"Now that writable canned queries (#698) have landed, it would be neat if they supported ""magic"" parameters - parameters that are automatically populated with:

- the current actor ID / other actor properties
- the current date and time
- the user's IP or user-agent

And maybe other things potentially added by plugins.",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/842/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
638241779,MDU6SXNzdWU2MzgyNDE3Nzk=,846,"""Too many open files"" error running tests",9599,closed,0,,,6,2020-06-13T22:11:40Z,2020-06-14T00:26:31Z,2020-06-14T00:26:31Z,OWNER,,"I got this on my laptop:
```pytest
...
/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.7/site-packages/jinja2/loaders.py:171: in get_source
    f = open_if_exists(filename)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

filename = '/Users/simon/Dropbox/Development/datasette/datasette/templates/400.html', mode = 'rb'

    def open_if_exists(filename, mode='rb'):
        """"""Returns a file descriptor for the filename if that file exists,
        otherwise `None`.
        """"""
        try:
>           return open(filename, mode)
E           OSError: [Errno 24] Too many open files: '/Users/simon/Dropbox/Development/datasette/datasette/templates/400.html'

/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.7/site-packages/jinja2/utils.py:154: OSError
```
Based on the conversation in https://github.com/pytest-dev/pytest/issues/2970 I'm worried that my tests are opening too many files without closing them.

In particular... I call `sqlite3.connect(filepath)` a LOT - and I don't ever call `conn.close()` on those opened connections:

https://github.com/simonw/datasette/blob/cf7a2bdb404734910ec07abc7571351a2d934828/datasette/database.py#L58-L60

Could this be resulting in my tests eventually opening too many unclosed file handles? How could I confirm this?",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/846/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
638104520,MDU6SXNzdWU2MzgxMDQ1MjA=,841,Research feasibility of 100% test coverage,9599,closed,0,,,9,2020-06-13T06:07:01Z,2020-06-13T21:38:46Z,2020-06-13T21:38:46Z,OWNER,,"Inspired by https://twitter.com/mikeal/status/1271473021593636866
> Almost every library I’ve written in the last 2 years has had 100% coverage and that’s probably not going to change in the future. It’s not that hard to start at 100% and hold onto it and the workflow it enables is so much nicer.",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/841/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
638229448,MDU6SXNzdWU2MzgyMjk0NDg=,843,Configure codecov.io,9599,closed,0,,,2,2020-06-13T20:45:00Z,2020-06-13T21:36:52Z,2020-06-13T21:36:52Z,OWNER,,_Originally posted by @simonw in https://github.com/simonw/datasette/issues/841#issuecomment-643660757_,107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/843/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
638230433,MDExOlB1bGxSZXF1ZXN0NDM0MDU1NzUy,844,Action to run tests and upload coverage report,9599,closed,0,,,1,2020-06-13T20:52:47Z,2020-06-13T21:36:52Z,2020-06-13T21:36:50Z,OWNER,simonw/datasette/pulls/844,Refs #843,107914493,pull,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/844/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",0,