TTime/backend/internal/database/migrations/0040_time_report_collections.sql

CREATE TABLE IF NOT EXISTS report_collection (
  id INTEGER PRIMARY KEY,
  owner_id INTEGER NOT NULL,
  project_id INTEGER NOT NULL,
  date DATE NOT NULL,
  signed_by INTEGER, -- NULL if not signed
  FOREIGN KEY (owner_id) REFERENCES users (id)
  FOREIGN KEY (signed_by) REFERENCES users (id)
);