Try hard code DB table name

lib/cylc/rundb.py

@@ -531,7 +531,7 @@ def select_checkpoint_id(self, callback, id_key=None):
 
         If id_key is specified, add where id == id_key to select.
         """
-        stmt = r"SELECT id,time,event FROM %s" % self.TABLE_CHECKPOINT_ID
+        stmt = r"SELECT id,time,event FROM checkpoint_id"
         stmt_args = []
         if id_key is not None:
             stmt += r" WHERE id==?"
@@ -542,8 +542,7 @@ def select_checkpoint_id(self, callback, id_key=None):
 
     def select_checkpoint_id_restart_count(self):
         """Return number of restart event in checkpoint_id table."""
-        stmt = (r"SELECT COUNT(event) FROM " + self.TABLE_CHECKPOINT_ID +
-                r" WHERE event==?")
+        stmt = r"SELECT COUNT(event) FROM checkpoint_id WHERE event==?"
         stmt_args = ['restart']
         for row in self.connect().execute(stmt, stmt_args):
             return row[0]
@@ -821,8 +820,7 @@ def take_checkpoints(self, event, other_daos=None):
         """
         id_ = 1
         for max_id, in self.connect().execute(
-                "SELECT MAX(id) FROM %(table)s" %
-                {"table": self.TABLE_CHECKPOINT_ID}):
+                "SELECT MAX(id) FROM checkpoint_id"):
             if max_id >= id_:
                 id_ = max_id + 1
         daos = [self]