new_contents: import psycopg2
  import yaml
  import sys
  import json
  import time
  import hashlib
  from syutil.base64util import encode_base64
  from syutil.crypto.signing_key import read_signing_keys
  from syutil.crypto.jsonsign import sign_json
  from syutil.jsonutil import encode_canonical_json
  
  
  def select_v1_keys(connection):
      cursor = connection.cursor()
      cursor.execute("SELECT server_name, key_id, verify_key FROM server_signature_keys")
      rows = cursor.fetchall()
      cursor.close()
      results = {}
      for server_name, key_id, verify_key in rows:
          results.setdefault(server_name, {})[key_id] = encode_base64(verify_key)
      return results
  
  
  def select_v1_certs(connection):
      cursor = connection.cursor()
      cursor.execute("SELECT server_name, tls_certificate FROM server_tls_certificates")
      rows = cursor.fetchall()
      cursor.close()
      results = {}
      for server_name, tls_certificate in rows:
          results[server_name] = tls_certificate
      return results
  
  
  def select_v2_json(connection):
      cursor = connection.cursor()
      cursor.execute("SELECT server_name, key_id, key_json FROM server_keys_json")
      rows = cursor.fetchall()
      cursor.close()
      results = {}
      for server_name, key_id, key_json in rows:
          results.setdefault(server_name, {})[key_id] = json.loads(str(key_json).decode("utf-8"))
      return results
  
  
  def convert_v1_to_v2(server_name, valid_until, keys, certificate):
      return {
          "old_verify_keys": {},
          "server_name": server_name,
          "verify_keys": keys,
          "valid_until_ts": valid_until,
          "tls_fingerprints": [fingerprint(certificate)],
      }
  
  
  def fingerprint(certificate):
      finger = hashlib.sha256(certificate)
      return {"sha256": encode_base64(finger.digest())}
  
  
  def rows_v2(server, json):
      valid_until = json["valid_until_ts"]
      key_json = encode_canonical_json(json)
      for key_id in json["verify_keys"]:
          yield (server, key_id, "-", valid_until, valid_until, buffer(key_json))
  
  
  def main():
      config = yaml.load(open(sys.argv[1]))
      valid_until = int(time.time() / (3600 * 24)) * 1000 * 3600 * 24
  
      server_name = config["server_name"]
      signing_key = read_signing_keys(open(config["signing_key_path"]))[0]
  
      database = config["database"]
      assert database["name"] == "psycopg2", "Can only convert for postgresql"
      args = database["args"]
      args.pop("cp_max")
      args.pop("cp_min")
      connection = psycopg2.connect(**args)
      keys = select_v1_keys(connection)
      certificates = select_v1_certs(connection)
      json = select_v2_json(connection)
  
      result = {}
      for server in keys:
          if not server in json:
              v2_json = convert_v1_to_v2(
                  server, valid_until, keys[server], certificates[server]
              )
              v2_json = sign_json(v2_json, server_name, signing_key)
              result[server] = v2_json
  
      yaml.safe_dump(result, sys.stdout, default_flow_style=False)
  
      rows = list(
          row for server, json in result.items()
          for row in rows_v2(server, json)
      )
  
      cursor = connection.cursor()
      cursor.executemany(
          "INSERT INTO server_keys_json ("
          " server_name, key_id, from_server,"
          " ts_added_ms, ts_valid_until_ms, key_json"
          ") VALUES (%s, %s, %s, %s, %s, %s)",
          rows
      )
      connection.commit()
  
  
  if __name__ == '__main__':
      main()
  
subject: Add script for converting server keys from v1 to v2