Add SQLite persistence, import-snapshot tool, and karma functionality

server/migrations/20260419073659_add_costume_lottery_effects.sql

@@ -0,0 +1,15 @@
+-- +goose Up
+CREATE TABLE user_costume_lottery_effects (
+    user_id               INTEGER NOT NULL REFERENCES users(user_id),
+    user_costume_uuid     TEXT    NOT NULL,
+    slot_number           INTEGER NOT NULL,
+    odds_number           INTEGER NOT NULL DEFAULT 0,
+    latest_version        INTEGER NOT NULL DEFAULT 0,
+    PRIMARY KEY (user_id, user_costume_uuid, slot_number)
+);
+
+ALTER TABLE user_costumes ADD COLUMN costume_lottery_effect_unlocked_slot_count INTEGER NOT NULL DEFAULT 0;
+
+-- +goose Down
+ALTER TABLE user_costumes DROP COLUMN costume_lottery_effect_unlocked_slot_count;
+DROP TABLE IF EXISTS user_costume_lottery_effects;