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We need a php developer with knowledge about mysqli, databases and record locking.

We have a new booking system that does not work correctly. They did not built transactions, commts and rollbacks. Collision is possible! There are four tables, but thay do not match with id's, so we can not rely on the system. For instance: the contents (see Excel dump from one table) "t.a.v. mevrouw Priscilla Ache" should only be mentioned in "fact_boeking_id" nrs 1812, 1837 and 1840. But it appears in a lot more records. The same for "Mevrouw Nel Grootveld": it should only be mentioned in record 1807. But it appears in a lot more records. Etc., etc.