Use only 15 decimal digits for MySQL double to match the Python float

trytond/backend/mysql/fields.py

@@ -55,7 +55,7 @@ class Float(fields.Float):
 
     @staticmethod
     def sql_type(field):
-        return ('double', 'double(255, 30)')
+        return ('double', 'double(255, 15)')
 
 
 class Numeric(fields.Numeric):

trytond/backend/mysql/table.py

@@ -399,7 +399,7 @@ class TableHandler(TableHandlerInterface):
         elif typname == 'decimal':
             res = 'decimal(65, 30)'
         elif typname == 'double':
-            res = 'double(255, 30)'
+            res = 'double(255, 15)'
         else:
             res = typname
         # Default value for timestamp doesn't work