Add SQL Linter using Squawk

[febrianyuwono]

Adding an integration to Squawk (website | repo) so we can double check if there are any database migrations that would cause unexpected downtime.

[jparise]

I would have expecting $column to be used here to set the "character" offset, but it looks like it's being used to adjust the $line above?

[febrianyuwono]

the $column here is showing how many rows are being warned by the linter
for example you have drop column like this:

   1 ALTER TABLE
   2   table_name
   3 DROP COLUMN
   4   column_name;
   5 
   6 -- test some column with spaces
   7               ALTER TABLE table_name DROP COLUMN column_name;
   8 
   9 
  10 -- test column with comment
  11 /* bla3 */ ALTER TABLE table_name DROP column column_name;

the first one will have line 1 column 0
the second one will have line 5 column 2 (so I added line + column - 1)
the third one will have line 8 column 3 (8+3-1 = 10)

so the calculated line is used to show which line is the starting one (includes comment)

and the char offset is not shown in the linter, so it's put as one

[jparise]

Looks good. Thanks for the contribution!