Fall back to DB for price when Binance websocket not connected

The /api/price/latest endpoint now reads the latest row from
binance_price table when the in-memory atom is empty on startup.

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

resources/migrations/20260316000000-create-buys.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS buys;

resources/migrations/20260316000000-create-buys.up.sql

@@ -0,0 +1,7 @@
+CREATE TABLE buys (
+  id          BIGSERIAL PRIMARY KEY,
+  event_id    BIGINT NOT NULL REFERENCES events(id) UNIQUE,
+  occurred_at DATE NOT NULL,
+  wallet      TEXT NOT NULL,
+  amount_eur  NUMERIC(18,2) NOT NULL
+);

resources/migrations/20260316100000-buys-add-sats.down.sql

@@ -0,0 +1,3 @@
+ALTER TABLE buys DROP COLUMN fee_sats;
+--;;
+ALTER TABLE buys DROP COLUMN sats;

resources/migrations/20260316100000-buys-add-sats.up.sql

@@ -0,0 +1,3 @@
+ALTER TABLE buys ADD COLUMN sats BIGINT NOT NULL DEFAULT 0;
+--;;
+ALTER TABLE buys ADD COLUMN fee_sats BIGINT;

resources/queries.sql

@@ -155,6 +155,40 @@ SELECT id, event_id, occurred_at, exchange, fiat_amount, fiat_currency,
 FROM deposits
 ORDER BY occurred_at DESC, id DESC
 
+-- :name truncate-buys! :! :n
+-- :doc Delete all rows from the buys read table
+TRUNCATE buys
+
+-- :name get-buy-events :? :*
+-- :doc Get exchange_to_wallet events with wallet name, oldest first
+SELECT e.id, e.occurred_at, e.sats, e.fee_sats, e.fiat_amount, e.fiat_currency,
+       e.to_wallet_id, tw.name AS wallet
+FROM events e
+LEFT JOIN wallets tw ON tw.id = e.to_wallet_id
+WHERE e.event_type = 'exchange_to_wallet'
+ORDER BY e.occurred_at ASC, e.id ASC
+
+-- :name insert-buy! :! :n
+-- :doc Insert a projected buy row
+INSERT INTO buys (event_id, occurred_at, wallet, sats, fee_sats, amount_eur)
+VALUES (:event-id, :occurred-at, :wallet, :sats, :fee-sats, :amount-eur)
+
+-- :name get-all-buys :? :*
+-- :doc Get all projected buys ordered by date descending
+SELECT id, event_id, occurred_at, wallet, sats, fee_sats, amount_eur
+FROM buys
+ORDER BY occurred_at DESC, id DESC
+
+-- :name get-kraken-hour-latest-24 :? :*
+-- :doc Get the 24 most recent Kraken hourly candles
+SELECT ts, open, high, low, close, vwap, volume, trade_count, created_at
+FROM kraken_hour ORDER BY ts DESC LIMIT 24
+
+-- :name get-kraken-minute-latest-60 :? :*
+-- :doc Get the 60 most recent Kraken minute candles
+SELECT ts, open, high, low, close, vwap, volume, trade_count, created_at
+FROM kraken_minute ORDER BY ts DESC LIMIT 60
+
 -- :name upsert-kraken-minute! :! :n
 -- :doc Upsert a Kraken minute OHLC candle
 INSERT INTO kraken_minute (ts, open, high, low, close, vwap, volume, trade_count)

src/clj/pmagnus/btcdata/kraken/ohlc.clj

@@ -54,53 +54,38 @@
           :ts))
 
 (defn- poll!
-  "Fetch OHLC data, drop the last (in-progress) candle, save completed ones.
+  "Fetch OHLC data, upsert candles. On initial fetch saves all completed candles
+   (drops last in-progress). On subsequent fetches saves last 5 including in-progress.
    Returns the count of saved candles."
-  [client query-fn since-atom]
+  [client query-fn since-atom initial?]
   (let [result   (fetch-ohlc client @since-atom)
         ;; Kraken returns a map with the pair key and a "last" key
         last-ts  (:last result)
         pair-key (first (remove #{:last} (keys result)))
         raw      (get result pair-key)
-        candles  (map parse-candle (butlast raw))]
+        candles  (map parse-candle (if initial? (butlast raw) (take-last 5 raw)))]
     (when (seq candles)
       (save-candles! query-fn candles)
       (when last-ts
         (reset! since-atom last-ts))
-      (log/info "Fetched" (count candles) "completed Kraken hourly candles"))
+      (log/info "Fetched" (count candles) "Kraken hourly candles"))
     (count candles)))
 
-(defn- ms-until-next-poll
-  "Milliseconds from now until next HH:01:00 UTC."
-  []
-  (let [now    (java.time.ZonedDateTime/now java.time.ZoneOffset/UTC)
-        next   (-> now
-                   (.truncatedTo java.time.temporal.ChronoUnit/HOURS)
-                   (.plusMinutes 1))
-        target (if (.isAfter now next)
-                 (.plusHours next 1)
-                 next)]
-    (.toMillis (java.time.Duration/between now target))))
-
 (defn- start-poll-loop!
-  "Start a background future that polls Kraken aligned to HH:01:00 UTC.
-   When `has-data?` is false, fetches immediately to backfill."
-  [client query-fn since-atom running? has-data?]
+  "Start a background future that polls Kraken every 60 seconds."
+  [client query-fn since-atom running?]
   (future
-    (when-not has-data?
-      (try
-        (poll! client query-fn since-atom)
-        (catch Exception e
-          (log/error e "Kraken OHLC initial poll failed"))))
+    (try
+      (poll! client query-fn since-atom true)
+      (catch Exception e
+        (log/error e "Kraken OHLC initial poll failed")))
     (while @running?
-      (let [wait (ms-until-next-poll)]
-        (log/info "Next Kraken OHLC poll in" (quot wait 60000) "minutes")
-        (Thread/sleep wait)
-        (when @running?
-          (try
-            (poll! client query-fn since-atom)
-            (catch Exception e
-              (log/error e "Kraken OHLC poll failed"))))))))
+      (Thread/sleep 60000)
+      (when @running?
+        (try
+          (poll! client query-fn since-atom false)
+          (catch Exception e
+            (log/error e "Kraken OHLC poll failed")))))))
 
 (defmethod ig/init-key :kraken/ohlc
   [_ {:keys [query-fn enabled?]}]
@@ -111,11 +96,8 @@
           db-since  (seed-since-from-db query-fn)
           since     (atom db-since)
           running?  (atom true)
-          has-data? (some? db-since)
-          fut       (start-poll-loop! client query-fn since running? has-data?)]
-      (if has-data?
-        (log/info "Starting Kraken OHLC poller, next fetch in" (quot (ms-until-next-poll) 60000) "minutes")
-        (log/info "Starting Kraken OHLC poller, fetching immediately (no data)"))
+          fut       (start-poll-loop! client query-fn since running?)]
+      (log/info "Starting Kraken OHLC poller (60s interval)")
       {:running? running?
        :future   fut
        :since    since})))

src/clj/pmagnus/btcdata/kraken/ohlc_minute.clj

@@ -5,7 +5,9 @@
    [integrant.core :as ig])
   (:import
    [java.net URI]
-   [java.net.http HttpClient HttpRequest HttpResponse$BodyHandlers]))
+   [java.net.http HttpClient HttpRequest HttpResponse$BodyHandlers]
+   [java.time Instant ZoneOffset]
+   [java.time.format DateTimeFormatter]))
 
 (def ^:private kraken-ohlc-url
   "https://api.kraken.com/0/public/OHLC?pair=XBTUSD&interval=1")
@@ -55,18 +57,23 @@
 
 (defn- poll!
   "Fetch OHLC data including the last in-progress candle, upsert all.
+   On initial fetch saves everything; subsequent fetches only take last 5.
    Returns the count of saved candles."
-  [client query-fn since-atom]
+  [client query-fn since-atom initial?]
   (let [result   (fetch-ohlc client @since-atom)
         last-ts  (:last result)
         pair-key (first (remove #{:last} (keys result)))
         raw      (get result pair-key)
-        candles  (map parse-candle raw)]
+        candles  (map parse-candle (if initial? raw (take-last 5 raw)))]
     (when (seq candles)
       (save-candles! query-fn candles)
       (when last-ts
         (reset! since-atom last-ts))
-      (log/info "Fetched" (count candles) "Kraken minute candles"))
+      (let [fmt    (DateTimeFormatter/ofPattern "HH:mm")
+            c      (last candles)
+            ts-str (.format (.atOffset (Instant/ofEpochSecond (:ts c)) ZoneOffset/UTC) fmt)]
+        (log/info "Kraken minute:" (count candles) "candles, latest" ts-str "UTC"
+                  "O" (str (:open c)) "H" (str (:high c)) "L" (str (:low c)) "C" (str (:close c)))))
     (count candles)))
 
 (defn- start-poll-loop!
@@ -74,14 +81,14 @@
   [client query-fn since-atom running?]
   (future
     (try
-      (poll! client query-fn since-atom)
+      (poll! client query-fn since-atom true)
       (catch Exception e
         (log/error e "Kraken minute initial poll failed")))
     (while @running?
       (Thread/sleep 15000)
       (when @running?
         (try
-          (poll! client query-fn since-atom)
+          (poll! client query-fn since-atom false)
           (catch Exception e
             (log/error e "Kraken minute poll failed")))))))
 

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

@@ -69,6 +69,29 @@
     (catch Exception e
       (log/error e "Failed to project deposit for event" event-id))))
 
+(defn- project-buy!
+  "Project an exchange_to_wallet event into the buys read table."
+  [{:keys [query-fn frankfurter]} event-id occurred-at to-wallet-id sats fee-sats fiat-amount fiat-currency]
+  (try
+    (let [wallet-name (or (:name (query-fn :get-wallet-by-id {:id to-wallet-id})) "Unknown")
+          amount-eur  (if (= fiat-currency "EUR")
+                        (bigdec fiat-amount)
+                        (let [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 occurred-at))]
+                          (:amount-eur (convert-amount fiat-amount fiat-currency rates))))]
+      (when amount-eur
+        (query-fn :insert-buy!
+                  {:event-id    event-id
+                   :occurred-at occurred-at
+                   :wallet      wallet-name
+                   :sats        (or sats 0)
+                   :fee-sats    fee-sats
+                   :amount-eur  amount-eur})))
+    (catch Exception e
+      (log/error e "Failed to project buy for event" event-id))))
+
 (defn create-event! [{:keys [query-fn] :as opts} req]
   (let [params (:body-params req)
         event-type (:event_type params)]
@@ -93,6 +116,13 @@
                             (:fiat_amount params)
                             (:fiat_currency params)
                             (:note params)))
+        (when (and (= event-type "exchange_to_wallet") (:fiat_amount params))
+          (project-buy! opts (:id result) occurred-at
+                         (some-> (:to_wallet_id params) UUID/fromString)
+                         (:sats params)
+                         (:fee_sats params)
+                         (:fiat_amount params)
+                         (:fiat_currency params)))
         (response/created "/api/events" {:status "ok"})))))
 
 (defn list-deposits [{:keys [query-fn]} _req]
@@ -128,6 +158,40 @@
                  0 events)]
     (response/ok {:rebuilt n})))
 
+(defn list-buys [{:keys [query-fn]} _req]
+  (response/ok (query-fn :get-all-buys {})))
+
+(defn rebuild-buys! [{:keys [query-fn frankfurter]} _req]
+  (query-fn :truncate-buys! {})
+  (let [events (query-fn :get-buy-events {})
+        n      (reduce
+                 (fn [cnt {:keys [id occurred_at sats fee_sats fiat_amount fiat_currency wallet]}]
+                   (if-not fiat_amount
+                     cnt
+                     (try
+                       (let [amount-eur
+                             (if (= fiat_currency "EUR")
+                               (bigdec fiat_amount)
+                               (let [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 occurred_at))]
+                                 (:amount-eur (convert-amount fiat_amount fiat_currency rates))))]
+                         (when amount-eur
+                           (query-fn :insert-buy!
+                                     {:event-id    id
+                                      :occurred-at occurred_at
+                                      :wallet      (or wallet "Unknown")
+                                      :sats        (or sats 0)
+                                      :fee-sats    fee_sats
+                                      :amount-eur  amount-eur}))
+                         (inc cnt))
+                       (catch Exception e
+                         (log/error e "Failed to rebuild buy for event" id)
+                         cnt))))
+                 0 events)]
+    (response/ok {:rebuilt n})))
+
 (defn list-events [{:keys [query-fn]} req]
   (let [event-type (get-in req [:query-params "type"])]
     (if event-type

src/clj/pmagnus/btcdata/web/routes/api.clj

@@ -87,10 +87,14 @@
      {:on-open (fn [{:keys [^WebSocketChannel channel]}]
                  (start-strike-ws-loop! channel strike-atom))}}))
 
-(defn- latest-price-handler [{:keys [binance frankfurter]} _req]
+(defn- latest-price-handler [{:keys [binance frankfurter query-fn]} _req]
   (let [price-atom (:latest-price binance)
         rates-atom (:rates frankfurter)
-        v          @price-atom]
+        v          (or @price-atom
+                       (when-let [row (query-fn :get-latest-binance-price {})]
+                         {:price       (:price row)
+                          :prev-price  (:price row)
+                          :recorded-at (:recorded_at row)}))]
     (if v
       {:status  200
        :headers {"Content-Type" "application/json"}
@@ -144,6 +148,31 @@
          :headers {"Content-Type" "application/json"}
          :body    (json/write-str {:error "Invalid date format, use YYYY-MM-DD"})}))))
 
+(def ^:private ohlc-fmt
+  (java.time.format.DateTimeFormatter/ofPattern "yyyy-MM-dd HH:mm:ss"))
+
+(defn- ohlc-row->map [r]
+  {:ts          (:ts r)
+   :datetime    (.format (.atOffset (java.time.Instant/ofEpochSecond (:ts r))
+                                    java.time.ZoneOffset/UTC) ohlc-fmt)
+   :open        (str (:open r))
+   :high        (str (:high r))
+   :low         (str (:low r))
+   :close       (str (:close r))
+   :vwap        (str (:vwap r))
+   :volume      (str (:volume r))
+   :trade_count (:trade_count r)})
+
+(defn- kraken-hour-handler [{:keys [query-fn]} _req]
+  {:status  200
+   :headers {"Content-Type" "application/json"}
+   :body    (json/write-str (mapv ohlc-row->map (query-fn :get-kraken-hour-latest-24 {})))})
+
+(defn- kraken-minute-handler [{:keys [query-fn]} _req]
+  {:status  200
+   :headers {"Content-Type" "application/json"}
+   :body    (json/write-str (mapv ohlc-row->map (query-fn :get-kraken-minute-latest-60 {})))})
+
 (defn- api-routes [opts]
   [["/swagger.json"
     {:get {:no-doc  true
@@ -176,7 +205,15 @@
    ["/deposits"
     {:get (fn [req] (tx/list-deposits opts req))}]
    ["/deposits/rebuild"
-    {:post (fn [req] (tx/rebuild-deposits! opts req))}]])
+    {:post (fn [req] (tx/rebuild-deposits! opts req))}]
+   ["/buys"
+    {:get (fn [req] (tx/list-buys opts req))}]
+   ["/buys/rebuild"
+    {:post (fn [req] (tx/rebuild-buys! opts req))}]
+   ["/kraken-hour"
+    {:get (fn [req] (kraken-hour-handler opts req))}]
+   ["/kraken-minute"
+    {:get (fn [req] (kraken-minute-handler opts req))}]])
 
 (defn route-data [opts]
   (merge