Query assistant for filings

Schema that will be passed to the model

CREATE TABLE "filings" (
  "candidate" TEXT,
  "office" TEXT,
  "party" TEXT,
  "year" INTEGER,
  "reporting_period" TEXT,
  "report_type" TEXT,
  "coverage_start" TEXT,
  "coverage_end" TEXT,
  "filing_date" TEXT,
  "review_status" TEXT,
  "published" INTEGER
)