949 missing leg in `miovision_api.open_issues` join

[gabrielwol]

What this pull request accomplishes:

• The addition of leg to anomalous_ranges broke the open_issues view + data check.
• Other minor improvements include: fixing the last_week_volume to only look at dates within the AR + formatting that number with commas
• fix a bad join with alerts table which caused last_week_volumes to appear higher.

Issue(s) this solves:

• Closes #949

What, in particular, needs to reviewed:

What needs to be done by a sysadmin after this PR is merged

• nothing, changes already implemented