Adding a ton of stuff

api/src/models/user-preference-value-validators.ts

@@ -0,0 +1,8 @@
+import { PreferenceKeys, PreferenceValueMap } from "@/models/user-preference"
+import { isFiniteNumber } from "@/utils/validators"
+
+export const preferenceValueValidators: {
+  [K in PreferenceKeys]: (value: unknown) => value is PreferenceValueMap[K]
+} = {
+  [PreferenceKeys.FLASHCARDS_DAY_STREAK]: isFiniteNumber,
+}