Where plaintiff lacks standing to seek federal review of state court decision on the merits, dismissal under Rooker-Feldman is not mandatory; the case can be dismissed for standing.
Municipal court is not a policymaking authority; the outcome of an adjudication therefore can't give rise to a municipal liability claim under S1983.
http://media.ca8.uscourts.gov/opndir/18/08/164560P.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.