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
1821108702,I_kwDOCGYnMM5si-ne,579,Special handling for SQLite column of type `JSON`,15178711,open,0,,,0,2023-07-25T20:37:23Z,2023-07-25T20:37:23Z,,CONTRIBUTOR,,"`sqlite-utils` should detect and have specially handling for column with a `JSON` column. For example:

```sql
CREATE TABLE ""dogs"" (
  id INTEGER PRIMARY KEY,
  name TEXT,
  friends JSON 
);
```

## Automatic Nesting

According to [""Nested JSON Values""](https://sqlite-utils.datasette.io/en/stable/cli.html#nested-json-values), sqlite-utils will only expand JSON if the `--json-cols` flag is passed. It looks like it'll try to `json.load` all text column to test if its JSON, which can get expensive on non-json columns. 

Instead, `sqlite-utils` should be default (ie without the `--json-cols` flags) do the `maybe_json()` operation on columns with a declared `JSON` type. So the above table would expand the `""friends""` column as expected, withoutthe `--json-cols` flag:

```bash
sqlite-utils dogs.db ""select * from dogs"" | python -mjson.tool
```

```
[
    {
        ""id"": 1,
        ""name"": ""Cleo"",
        ""friends"": [
            {
                ""name"": ""Pancakes""
            },
            {
                ""name"": ""Bailey""
            }
        ]
    }
]
```

---

I'm sure there's other ways `sqlite-utils` can specially handle JSON columns, so keeping this open while I think of more",140912432,issue,,,"{""url"": ""https://api.github.com/repos/simonw/sqlite-utils/issues/579/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,
1355193529,I_kwDOCGYnMM5Qxpy5,479,OperationalError: cannot VACUUM from within a transaction,7908073,open,0,,,0,2022-08-30T05:34:24Z,2022-08-30T05:34:24Z,,CONTRIBUTOR,,"Maybe when calling `.vacuum()` and other DB-level write-lock operations `sqlite_utils` could guard against this error message by automatically committing first?

```
     46 db[""media""].optimize()  # type: ignore
---> 47 db.vacuum()

File ~/.local/lib/python3.10/site-packages/sqlite_utils/db.py:1047, in Database.vacuum(self)
   1045 def vacuum(self):
   1046     ""Run a SQLite ``VACUUM`` against the database.""
-> 1047     self.execute(""VACUUM;"")

File ~/.local/lib/python3.10/site-packages/sqlite_utils/db.py:470, in Database.execute(self, sql, parameters)
    468     return self.conn.execute(sql, parameters)
    469 else:
--> 470     return self.conn.execute(sql)

OperationalError: cannot VACUUM from within a transaction
```

It might also be nice to add a sentence or two about how transactions are committed on the [docs page](https://sqlite-utils.datasette.io/en/latest/python-api.html#detect-fts). When I was swapping out my sqlite3 code for this library it was nice that everything was pretty much drop-in but I was/am unsure what to do about the places I explicitly call `.commit()` in my code

Related to https://github.com/simonw/sqlite-utils/issues/121",140912432,issue,,,"{""url"": ""https://api.github.com/repos/simonw/sqlite-utils/issues/479/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,
1324659241,I_kwDOCGYnMM5O9LIp,459,Single quoted transform recipes on Windows do not work as expected ,19921,open,0,,,0,2022-08-01T16:14:54Z,2022-08-01T16:14:54Z,,CONTRIBUTOR,,"Trying to follow the tutorial for sqlite-utils and datasette https://datasette.io/tutorials/clean-data on Windows 11 OS `Microsoft Windows [Version 10.0.22622.440]`, with sqlite-utils and datasette installed using pipx.

```
pipx list
package datasette 0.61.1, installed using Python 3.10.4
    - datasette.exe
package sqlite-utils 3.28, installed using Python 3.10.4
    - sqlite-utils.exe
```  

In the step to transform dates into ISO dates the quoted value `'r.parsedatetime(value)'` is copied verbatim into the columns instead of applying the output of the Python recipe.

```
sqlite-utils convert manatees.db locations \
  REPDATE created_date last_edited_date \
  'r.parsedatetime(value)' --dry-run

1975/01/31 00:00:00+00
 --- becomes:
r.parsedatetime(value)

Would affect 13568 rows
```

However, if I change the code from single quotes to double quotes, it works as expected.

```
sqlite-utils convert manatees.db locations \
  REPDATE created_date last_edited_date \
  ""r.parsedatetime(value)"" --dry-run

1975/01/31 00:00:00+00
 --- becomes:
1975-01-31T00:00:00+00:00

Would affect 13568 rows
```

Specifying the transform code recipe should work with single quotes on Windows.",140912432,issue,,,"{""url"": ""https://api.github.com/repos/simonw/sqlite-utils/issues/459/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,