  The Shower Database (SD) of the Meteor Data Center (MDC) has been operating
for 15 years and is used by the entire community of meteor astronomers. It
contains meteor showers categorised in individual lists on the basis of their
status. Since the inception of the SD, no objective rules for moving showers
between individual lists have been established. The content of the SD has not
yet been checked for the correctness of the meteor data contained therein. Our
aims are (1) to formulate criteria for nominating meteor showers for
established status, (2) to improve the rules for the removal of showers, (3) to
verify and enhance the content of the SD, and (4) to improve the user area of
the MDC SD. The criteria for moving showers from the Working list to the Lists
of established or removed Showers were generated using an empirical evaluation
of their impact on the registered showers. The correctness of the parameters of
each stream included in the SD was checked by comparing them with the values
given in the source publications. We developed a set of criteria for nominating
showers to be established. We objectified rules for the temporary and permanent
removal of meteor showers from the Working list. Both of our proposed new
procedures were approved by a vote of the commission F1 of the IAU in July
2022. We verified more than $1350$ data records of the MDC SD and introduced
$\sim$1700 corrections. We included new parameters for shower characterisation.
As a result of our verification procedure, 117 showers have been moved to the
List of removed showers. As of October 2022, the SD contains 923 showers, 110
of which are in the List of established Showers and 813 are in the Working
list. We also improved the user area of the SD and added a simple tool to allow
a quick check of the similarity of a new shower to those in the database.
