feat: move email tokens to valkey

No need to have them in permanent DB storage when they are temporary

migrations/2025-06-03-103311_remove_email_tokens/down.sql

@@ -0,0 +1,7 @@
+-- This file should undo anything in `up.sql`
+CREATE TABLE email_tokens (
+    token VARCHAR(64) NOT NULL,
+    user_uuid uuid UNIQUE NOT NULL REFERENCES users(uuid),
+    created_at TIMESTAMPTZ NOT NULL,
+    PRIMARY KEY (token, user_uuid)
+);

migrations/2025-06-03-103311_remove_email_tokens/up.sql

@@ -0,0 +1,2 @@
+-- Your SQL goes here
+DROP TABLE email_tokens;