id,node_id,number,title,user,user_label,state,locked,assignee,assignee_label,milestone,milestone_label,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,repo_label,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
646734280,MDExOlB1bGxSZXF1ZXN0NDQwOTQ2ODE3,869,Magic parameters for canned queries,9599,simonw,closed,0,,,5533512,Datasette 0.45,1,2020-06-27T18:37:21Z,2020-06-28T02:58:18Z,2020-06-28T02:58:17Z,OWNER,simonw/datasette/pulls/869,"Implementation for #842

TODO:

- [x] Add tests for built-in magic parameters
- [x] Magic parameters should not show up as blank form fields on the query page
- [x] Update documentation for new `_request_X` (now called `_header_X`) implementation where X is a key from the ASGI scope
- [x] Make sure these only work for canned queries, not for arbitrary SQL queries (security issue)
- [x] Add test for the `register_magic_parameters` plugin hook
- [x] Add documentation for the `register_magic_parameters` plugin hook
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