You should take a look at tcl's catch command.  You could
put all your SQLite code in one catch command,

if {[catch {
    db eval begin   ;# or maybe {begin on conflict rollback}
    db eval {... }
    db eval {... }
    db eval {... }
    db eval commit} err]} {
        doSomething $err
}

or you could catch each 'db eval ...', or anything in between.

Regards

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