Add unique constraints to featuredAdventures and worldTravelCountryRegions tables, and insert data for Canada, Germany, and the US regions.

sql/de.sql

@@ -0,0 +1,20 @@
+INSERT INTO "worldTravelCountryRegions" (name, country_code)
+VALUES
+  ('Baden-Württemberg', 'de'),
+  ('Bavaria', 'de'),
+  ('Berlin', 'de'),
+  ('Brandenburg', 'de'),
+  ('Bremen', 'de'),
+  ('Hamburg', 'de'),
+  ('Hesse', 'de'),
+  ('Lower Saxony', 'de'),
+  ('Mecklenburg-Vorpommern', 'de'),
+  ('North Rhine-Westphalia', 'de'),
+  ('Rhineland-Palatinate', 'de'),
+  ('Saarland', 'de'),
+  ('Saxony', 'de'),
+  ('Saxony-Anhalt', 'de'),
+  ('Schleswig-Holstein', 'de'),
+  ('Thuringia', 'de');
+
+ON CONFLICT (name) DO NOTHING;