Change events.occurred_at from TIMESTAMPTZ to DATE

Make date required, remove default. Simplifies date handling
throughout the controller.

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

resources/migrations/20260308200000-events-occurred-at-date.down.sql

@@ -0,0 +1,5 @@
+ALTER TABLE deposits ALTER COLUMN occurred_at TYPE TIMESTAMPTZ USING occurred_at::timestamptz;
+--;;
+ALTER TABLE events ALTER COLUMN occurred_at SET DEFAULT NOW();
+--;;
+ALTER TABLE events ALTER COLUMN occurred_at TYPE TIMESTAMPTZ USING occurred_at::timestamptz;

resources/migrations/20260308200000-events-occurred-at-date.up.sql

@@ -0,0 +1,5 @@
+ALTER TABLE events ALTER COLUMN occurred_at TYPE DATE USING occurred_at::date;
+--;;
+ALTER TABLE events ALTER COLUMN occurred_at DROP DEFAULT;
+--;;
+ALTER TABLE deposits ALTER COLUMN occurred_at TYPE DATE USING occurred_at::date;

src/clj/pmagnus/btcdata/web/controllers/transactions.clj

@@ -5,7 +5,7 @@
    [pmagnus.btcdata.frankfurter.rates :as rates]
    [ring.util.http-response :as response])
   (:import
-   [java.time Instant LocalDate ZoneOffset]
+   [java.time LocalDate]
    [java.util UUID]))
 
 (defn list-wallets [{:keys [query-fn]} req]
@@ -51,11 +51,10 @@
   (try
     (let [wallet   (query-fn :get-wallet-by-id {:id to-wallet-id})
           exchange (or (:name wallet) "Unknown")
-          date     (.toLocalDate (.atOffset occurred-at ZoneOffset/UTC))
-          rates    (or (query-fn :get-currency-rates-by-date {:rate-date date})
+          rates    (or (query-fn :get-currency-rates-by-date {:rate-date occurred-at})
                        (rates/fetch-and-persist-for-date!
                          (:client frankfurter) (:url frankfurter)
-                         query-fn date))
+                         query-fn occurred-at))
           amounts  (if rates
                      (convert-amount fiat-amount fiat-currency rates)
                      {:amount-eur nil :amount-dkk nil :amount-usd nil})]
@@ -75,9 +74,9 @@
         event-type (:event_type params)]
     (if-not (#{"bank_to_exchange" "exchange_to_wallet" "wallet_to_wallet"} event-type)
       (response/bad-request {:error "Invalid event_type"})
-      (let [occurred-at (if-let [ts (:occurred_at params)]
-                          (Instant/parse ts)
-                          (Instant/now))
+      (let [occurred-at (if-let [d (:occurred_at params)]
+                          (LocalDate/parse d)
+                          (LocalDate/now))
             row {:event-type     event-type
                  :occurred-at    occurred-at
                  :sats           (:sats params)