Query assistant for public_contributions

CREATE TABLE public_contributions (
  "canon_id" INTEGER,  -- donor id; one id per donor across name variants
  "donor_name" TEXT,  -- the DONOR (who gave)
  "employer" TEXT,  -- the donor's employer
  "occupation" TEXT,  -- the donor's occupation
  "is_organization" INTEGER,
  "entity_type" TEXT,
  "entity_subtype" TEXT,
  "city" TEXT,  -- the DONOR's city, not the candidate's
  "state" TEXT,  -- the DONOR's state, not the candidate's
  "zip" TEXT,  -- the DONOR's ZIP, not the candidate's
  "amount" REAL,  -- dollars
  "date" TEXT,
  "is_inkind" INTEGER,
  "designated_election_phase" TEXT,
  "campaign_id" INTEGER,  -- the RECIPIENT campaign
  "reporting_period" TEXT,
  "party" TEXT,  -- the recipient candidate's party
  "election_cycle_year" INTEGER,  -- election year of the recipient campaign
  "candidate_name" TEXT,  -- the RECIPIENT candidate
  "office_name" TEXT,  -- the office the recipient ran for, e.g. 'U.S. Senator (Class II)', 'U.S. Senator (Class I)', 'U.S. Representative, District 7', 'U.S. Representative, District 6'; names include the district, so match a whole chamber with LIKE 'U.S. Representative%', never =
  "floor_cycle_key" TEXT
);
CREATE INDEX idx_pc_pair ON public_contributions(canon_id, campaign_id);
CREATE INDEX idx_pc_campaign ON public_contributions(campaign_id)