Add wallet_type column to distinguish exchanges from wallets

Exchanges (can receive bank deposits) vs wallets (cold storage only).
Supports ?type= filter on GET /api/wallets.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

resources/migrations/20260308100000-add-wallet-type.down.sql

@@ -0,0 +1 @@
+ALTER TABLE wallets DROP COLUMN wallet_type;

resources/migrations/20260308100000-add-wallet-type.up.sql

@@ -0,0 +1,4 @@
+ALTER TABLE wallets ADD COLUMN wallet_type TEXT NOT NULL DEFAULT 'exchange';
+--;;
+UPDATE wallets SET wallet_type = 'wallet'
+WHERE name IN ('Cold', 'Coldcard', 'Nunchuk Multi Sig');

resources/queries.sql

@@ -70,15 +70,19 @@ SELECT rate_date, eur, dkk, eur_dkk, updated_at FROM currencies WHERE rate_date
 
 -- :name insert-wallet! :! :n
 -- :doc Insert a new wallet
-INSERT INTO wallets (name) VALUES (:name)
+INSERT INTO wallets (name, wallet_type) VALUES (:name, :wallet-type)
 
 -- :name get-all-wallets :? :*
 -- :doc Get all wallets
-SELECT id, name, created_at FROM wallets ORDER BY name
+SELECT id, name, wallet_type, created_at FROM wallets ORDER BY name
+
+-- :name get-wallets-by-type :? :*
+-- :doc Get wallets filtered by type
+SELECT id, name, wallet_type, created_at FROM wallets WHERE wallet_type = :wallet-type ORDER BY name
 
 -- :name get-wallet-by-id :? :1
 -- :doc Get a wallet by ID
-SELECT id, name, created_at FROM wallets WHERE id = :id
+SELECT id, name, wallet_type, created_at FROM wallets WHERE id = :id
 
 -- Events --------------------------------------------------------------------