## Summary
To implement {T400284}, we need to give `afl_ip` column a default value in the database definition
## Background & Technical notes
- As part of {T395612}, we are removing the `afl_ip` column from the `abuse_filter_log` table as it duplicates the new `afl_ip_hex` column
- To be able to implement {T400284}, we need to be able to stop writing any value to `afl_ip`
-- However, the column is defined as having no default value which means that we can't yet not define anything as it's value
-- Therefore, we first need to assign a default to `afl_ip` so that we can stop writing to it once the change is deployed
- While doing this, we should consider removing the default for `afl_ip_hex` as we expect that all code should write to this column
## Acceptance criteria
- [ ] The `afl_ip` column for the `abuse_filter_log` table has a default value of an empty string
- [ ] The `afl_ip_hex` column for the `abuse_filter_log` table has no default value