You are propably wrong here, It is of course possible that there are "real" databases somewhere but chances for that are fairly slim. I have searched the device for that kind of data quite thoroughly and tracker DB's are the only thing I have found. You are propably thinking of this sentence; "- Tracker is an indexer that doesn't touch your data in any way except for reading it and allowing other programs to read it; the team behind it have worked real hard on making it as power efficient." That refers to the way tracker indexes images, sounds and movies on the device.
messaging-ui has its own database not related to tracker