id,node_id,number,state,locked,title,user,body,created_at,updated_at,closed_at,merged_at,merge_commit_sha,assignee,milestone,draft,head,base,author_association,repo,url,merged_by,auto_merge
718734191,MDExOlB1bGxSZXF1ZXN0NzE4NzM0MTkx,22,open,0,Make sure that case-insensitive column names are unique,32016596,"This closes #21.

When there are metadata entries with the same case insensitive string, then there is an error when trying to create a new column for that metadata entry in the database table, because a column with that case insensitive name already exists.

```xml
 <Record type=""HKQuantityTypeIdentifierDietaryCholesterol"" sourceName=""MyFitnessPal"" sourceVersion=""35120"" unit=""mg"" creationDate=""2021-07-04 20:55:27 +0200"" startDate=""2021-07-04 20:55:00 +0200"" endDate=""2021-07-04 20:55:00 +0200"" value=""124"">
  <MetadataEntry key=""meal"" value=""Dinner""/>
  <MetadataEntry key=""Meal"" value=""Dinner""/>
 </Record>
```

The code added in this PR checks if a key already exists in a record and if so adds a number at its end. The resulting column names look like the example below then. Interestingly, the column names viewed with Datasette are not case insensitive.

```text
startDate, endDate, value, unit, sourceName, sourceVersion, creationDate, metadata_meal, metadata_Meal_2, metadata_Mahlzeit
```
",2021-08-24T13:13:38Z,2021-08-24T13:26:20Z,,,c757d372c10284cd6fa58d144549bc89691341c3,,,0,b16fb556f84a0eed262a518ca7ec82a467155d23,9fe3cb17e03d6c73222b63e643638cf951567c4c,FIRST_TIME_CONTRIBUTOR,197882382,https://github.com/dogsheep/healthkit-to-sqlite/pull/22,,