Add gorm dialect for db_pem_storer

[waldofouche]

Solves #83 (comment)

Adds a new GormDBDataType selector to swap the schema for DB based pems to a data type for MySQL and a best guess equivlaents in sqlite for bytea.

After this change, I was able to pass the migration from file-system to db backed pem storage:

mysql@RDS[]> describe private_keys_federation;
+------------+--------------+------+-----+---------+-------+
| Field      | Type         | Null | Key | Default | Extra |
+------------+--------------+------+-----+---------+-------+
| kid        | varchar(255) | NO   | PRI | NULL    |       |
| pem_data   | longblob     | NO   |     | NULL    |       |
| created_at | bigint       | YES  |     | NULL    |       |
| updated_at | bigint       | YES  |     | NULL    |       |
+------------+--------------+------+-----+---------+-------+
4 rows in set (0.03 sec)

mysql@RDS[]> select kid,created_at, updated_at from private_keys_federation;
+---------------------------------------------+------------+------------+
| kid                                         | created_at | updated_at |
+---------------------------------------------+------------+------------+
| redacted | 1781053088 | 1781056091 |
| federation_ES256                            | 1781053088 | 1781056091 |
| federation_ES256f                           | 1781053088 | 1781056091 |
| redacted | 1781053088 | 1781056091 |
+---------------------------------------------+------------+------------+
4 rows in set (0.02 sec)

I also added some test cases, but they seems pretty meh

[deepsource-io]

DeepSource Code Review

We reviewed changes in eb089ed...d34ebc2 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Go		Jun 10, 2026 7:06a.m.	Review ↗

---

Important

AI Review is run only on demand for your team. We're only showing results of static analysis review right now. To trigger AI Review, comment @deepsourcebot review on this thread.