According to a Tickhistory support FAQ article (title "What does USER Qualifiers indicate in Tick History?" It apperas in a sidebar and I can't find a link to it), tickhistory trades include a generic refinitiv-generated `USER` Qualifier field that is portable across exchanges. The only values mentioned in that article are:
- Off Book Trades[USER]
- Exhausted Bid and Ask[USER]
- Block Trade [USER]
- Previous Day Trade[USER]
I have also seen in data:
- Special Trades[USER]
Can someone provide a link to the complete list of possible values for this qualifier field?