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
1432377191,I_kwDOCGYnMM5VYFdn,509,`sqlite-utils transform` breaks DEFAULT string values and STRFTIME(),2199875,closed,0,,,0,2022-11-02T02:32:23Z,2023-05-08T21:13:38Z,2023-05-08T21:13:38Z,NONE,,"Very nice library! Our team found sqlite-utils through @simonw's [comment on the ""Simple declarative schema migration for SQLite"" article](https://news.ycombinator.com/item?id=31249823), and we were excited to use it, but unfortunately `sqlite-utils transform` seems to break our DB. 

Running `sqlite-utils transform` to modify a column mangles their DEFAULT values:

- Default string values are wrapped in extra single quotes
- Function expressions such as [`STRFTIME()`](https://www.sqlite.org/lang_datefunc.html) are turned into strings!

------

Here are steps to reproduce:

**Original database**

```
$ sqlite3 test.db << EOF
CREATE TABLE mytable (
    col1 TEXT DEFAULT 'foo',
    col2 TEXT DEFAULT (STRFTIME('%Y-%m-%d %H:%M:%f', 'NOW'))
)
EOF

$ sqlite3 test.db ""SELECT sql FROM sqlite_master WHERE name = 'mytable';""
CREATE TABLE mytable (
    col1 TEXT DEFAULT 'foo',
    col2 TEXT DEFAULT (STRFTIME('%Y-%m-%d %H:%M:%f', 'NOW'))
)
```

**Modified database after sqlite-utils**

```
$ sqlite3 test.db ""INSERT INTO mytable DEFAULT VALUES; SELECT * FROM mytable;""
foo|2022-11-02 02:26:58.038

$ sqlite-utils transform test.db mytable --rename col1 renamedcol1

$ sqlite3 test.db ""SELECT sql FROM sqlite_master WHERE name = 'mytable';""
CREATE TABLE ""mytable"" (
   [renamedcol1] TEXT DEFAULT '''foo''',
   [col2] TEXT DEFAULT 'STRFTIME(''%Y-%m-%d %H:%M:%f'', ''NOW'')'
)

$ sqlite3 test.db ""INSERT INTO mytable DEFAULT VALUES; SELECT * FROM mytable;""
foo|2022-11-02 02:26:58.038
'foo'|STRFTIME('%Y-%m-%d %H:%M:%f', 'NOW')
```

(Related: #336)",140912432,issue,,,"{""url"": ""https://api.github.com/repos/simonw/sqlite-utils/issues/509/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed