private VTMatchTagDB getMatchTagNew(DBRecord record) {
		if (record == null) {
			throw new AssertException("How can we have a null record?!!!");
		}

		try {
			lock.acquire();
			VTMatchTagDB matchTagDB = tagCache.get(record);
			if (matchTagDB == null) {
				matchTagDB = new VTMatchTagDB(this, tagCache, record);
			}

			return matchTagDB;
		}
		finally {
			lock.release();
		}
	}
Mark the state of a Version Tracking item as having changed and generate
the event of the specified type.  Any or all parameters may be null.
@param eventType event type
@param affected the version tracking object that was affected by the change.
@param oldValue original value or an Object that is related to the event.
@param newValue new value or an Object that is related to the event.
Ghidra/Features/VersionTracking/src/main/java/ghidra/feature/vt/api/db/VTSessionDB.java