Add helper scripts for getting exchange rates

contrib/scripts/get_exchange_rates_since_1990.py

@@ -0,0 +1,33 @@
+from datetime import datetime
+
+import requests
+
+url = "https://data.kurzy.cz/json/meny/b[6]den[{0}].json"
+date_format = "%Y%m%d"
+years = range(2000, datetime.now().year + 1)
+dates = [
+    datetime.strftime(datetime(day=1, month=1, year=year), format=date_format)
+    for year in years
+]
+for date in dates:
+    final_url = url.format(date)
+    year = date[:4]
+    response = requests.get(final_url)
+    response.raise_for_status()
+    data = response.json()
+    if kurzy := data.get("kurzy"):
+        with open("output.yaml", mode="a") as o:
+            rates = [
+                f"""
+- model: games.exchangerate
+            fields:
+            currency_from: {currency_name}
+            currency_to: CZK
+            year: {year}
+            rate: {kurzy.get(currency_name, {}).get("dev_stred", 0)}
+                """
+                for currency_name in ["EUR", "USD", "CNY"]
+                if kurzy.get(currency_name)
+            ]
+            o.writelines(rates)
+    # time.sleep(0.5)