GCC Puller: Create primary key only if not exist

[chmnata]

Ran into an error ERROR: multiple primary keys for table "loop_detector" are not allowed

Not exactly sure why this wasn't an issue before.... And because there is no add constraint if exist, there are a couple of solutions:

• drop primary key and create again (NO CANNOT DO, BECAUSE IT WILL MESS WITH OUR AUDIT TABLE STRUCTURE)
• Look at information table and see if a primary key exist on the table
• Edit the create table line to do something like

Create table if not exist (
column1 data_type, 
column2 data_type, 
constraint pk_mail_app_recipients primary key (column1)

Then it will only add a primary key constraint when a new table is created.

https://github.com/CityofToronto/bdit_data-sources/blob/f79fd6eee455f2ca35a002ba081270f8f13012c1/gis/gccview/gcc_puller_functions.py#L191

[gabrielwol]

@chmnata should this issue also be closed as not planned?