Per T310890: Decommission the MediaViewer and MultimediaViewer* instruments, the following tables should be dropped:
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show tables in event like '*mediaviewer*'; mediaviewer multimediaviewerattribution multimediaviewerdimensions multimediaviewerduration multimediaviewernetworkperformance multimediaviewerversuspagefileperformance
The associated tables in the event_sanitized database should also be dropped.