Overhaul email sending system

Add logging and saving templates to the database for historical
accuracy.

db/dberrors/comms.email_contact.bob.go

@@ -0,0 +1,17 @@
+// Code generated by BobGen psql v0.42.1. DO NOT EDIT.
+// This file is meant to be re-generated in place and/or deleted at any time.
+
+package dberrors
+
+var CommsEmailContactErrors = &commsEmailContactErrors{
+	ErrUniqueEmailPkey: &UniqueConstraintError{
+		schema:  "comms",
+		table:   "email_contact",
+		columns: []string{"address"},
+		s:       "email_pkey",
+	},
+}
+
+type commsEmailContactErrors struct {
+	ErrUniqueEmailPkey *UniqueConstraintError
+}