- old `accounts` table is moved/mapped to `keypairs` and `keypairs_accounts`
- `keycards` table has foreign key which refers to `keypairs.key_uid`
- `Keypair` introduced as a new type
- api endpoints updated according to this change
* sync local deleted messages
* rebase
* add REPLACE
* fix lint
* defer rows.Close() / rename function
* add local pair test
* replace unused clock with _
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frank