Store minimum_charge in the database

gratipay/billing/payday.py

@@ -27,7 +27,7 @@
 
 
 with open('sql/payday.sql') as f:
-    PAYDAY = f.read() % {'minimum_charge': MINIMUM_CHARGE}
+    PAYDAY = f.read()
 
 
 class ExceptionWrapped(Exception): pass

gratipay/testing/__init__.py

@@ -115,6 +115,7 @@ def clear_tables(self):
             except (IntegrityError, InternalError):
                 tablenames.insert(0, tablename)
         self.db.run("ALTER SEQUENCE participants_id_seq RESTART WITH 1")
+        self.db.run("INSERT INTO settings DEFAULT VALUES")
 
 
     def make_elsewhere(self, platform, user_id, user_name, **kw):

gratipay/wireup.py

@@ -57,6 +57,9 @@ def db(env):
         db.register_model(model)
     gratipay.billing.payday.Payday.db = db
 
+    from gratipay.billing.exchanges import MINIMUM_CHARGE
+    db.run('UPDATE settings SET minimum_charge=%s', (MINIMUM_CHARGE,))
+
     return db
 
 def mail(env, project_root='.'):

sql/branch.sql

@@ -1,4 +1,6 @@
 BEGIN;
     UPDATE payment_instructions SET due = 0 WHERE amount = 0 AND due != 0;
     UPDATE payment_instructions SET due = floor(9.41/(amount)) * amount WHERE due > 9.41;
+    CREATE TABLE settings (minimum_charge numeric(35,2) DEFAULT NULL);
+    INSERT INTO settings DEFAULT VALUES;
 END;

sql/payday.sql

@@ -190,7 +190,7 @@ CREATE OR REPLACE FUNCTION process_payment_instruction() RETURNS trigger AS $$
         IF (NEW.amount + NEW.due <= participant.new_balance OR participant.card_hold_ok) THEN
             EXECUTE pay(NEW.participant, NEW.team, NEW.amount + NEW.due, 'to-team');
             RETURN NEW;
-        ELSIF NEW.amount + NEW.due <= %(minimum_charge)s THEN
+        ELSIF NEW.amount + NEW.due <= (SELECT minimum_charge FROM settings) THEN
             EXECUTE park(NEW.participant, NEW.team, NEW.amount + NEW.due);
         END IF;