The Edit log table contains records with the XML details (EDITDATA field) around edits as they occur within the database. These build the sequence of events that the system can play out and contain details about which user, made what changes and when. It's been beneficial for us at times when trying to evaluate workflows and potential troubleshooting but isn't overly easy to exploit as an audit log. It's a system table that is generally advised as a don't touch but if someone put in some good coding work I am sure it could be exploited for validations, etc.
Here's an example of the XML details
<?xml version="1.0"?>
<RouteEditModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" SchemaVersion="2">
<RouteEditActivity xsi:type="RetireRouteInfo" LrsId="3ae0f120-7e23-47f2-b70d-3616cee756b4" NetworkId="1" RouteId="TCLETR00914**C" OperationTime="2018-07-03T00:00:00" FirstM="-0" LastM="0.22" IsPerformDownstreamCalibration="true" DoNotApplyEventBehaviors="false" IsUseWholeRoute="false">
<OverlappedPortions />
<RetiredPortion OldFromMeasure="0.165" OldToMeasure="0.22" NewFromMeasure="NaN" NewToMeasure="NaN" />
</RouteEditActivity>
</RouteEditModel>
The ACTIVITYTYPE field within this Edit log table contains values which align with the dActivityType domain. I can't speak to your 12 & 13 values. I can say in our system a 9 = Retire Route. You say yours ends at a 7 so for us an 8 = Reassign Route, 10 = Reverse Route and 11 = Shorten Route. This one piece I can say I've not yet fully figured out. I can say, reviewing REST services of a different agencies R&H data who is at 10.5.1 (which is the same version as us) shows they only have 7 as well (details below) and these don't align with what our values are. My only hunch could be that we began using R&H at version 10.2.2 and did fairly quick upgrades to 10.3.1. We sat there for a couple years and then jumped to 10.5.1 but I can't say whether or not our values differ because they have carried through from earlier versions or not.
domain:
type: codedValue
name: dActivityType
codedValues: (7)
name: Create Route
code: 1
name: Calibrate Route
code: 2
name: Reverse Route
code: 3
name: Retire Route
code: 4
name: Extend Route
code: 5
name: Reassign Route
code: 6
name: Realign Route
code: 7