- limit missing headers results set to 100 so that extraction doesn't
excessively block delegation
- wrap checked headers functions in repository struct
- move storage repository to factory, to correspond with event
repository path
- remove unused files
- reformat sql
- remove line breaks in imports
- Table has foreign key to blocks
- Add transaction RLP and transaction index to table
- Enables other tables with standalone transactions or transactions
associated with other data structures (e.g. headers)
