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
613755043,MDU6SXNzdWU2MTM3NTUwNDM=,110,Support decimal.Decimal type,134771,closed,0,,,6,2020-05-07T03:57:19Z,2020-05-11T01:58:20Z,2020-05-11T01:50:11Z,NONE,,"Decimal types in Postgres cause a failure in db.py data type selection
---
I have a Django app using a MoneyField, which uses a `numeric(14,0)` data type in Postgres (https://www.postgresql.org/docs/9.3/datatype-numeric.html). When attempting to export that table I get the following error:

```bash
$ db-to-sqlite --table isaweb_proposal ""postgres://connection"" test.db
....
    column_type=COLUMN_TYPE_MAPPING[column_type],
KeyError: <class 'decimal.Decimal'>
```

Looking at `sql_utils.db.py` at 292-ish it's clear that there is no matching type for what I assume SQLAlchemy interprets as Python decimal.Decimal.

From the [SQLite docs](https://www.sqlite.org/datatype3.html#affinity_name_examples) it looks like DECIMAL in other DBs are considered numeric.

I'm not quite sure if it's as simple as adding a data type to that list or if there are repercussions beyond it.

Thanks for a great tool!",140912432,issue,,,"{""url"": ""https://api.github.com/repos/simonw/sqlite-utils/issues/110/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed