  Narrow-line Seyfert 1 (NLSy1) galaxies are an enigmatic class of active
galactic nuclei (AGN) that exhibit peculiar multiwavelength properties across
the electromagnetic spectrum. For example, these sources have allowed us to
explore the innermost regions of the central engine of AGN using X-ray
observations and have also provided clues about the origin of relativistic jets
considering radio and gamma-ray bands. Keeping in mind the ongoing and upcoming
wide-field, multi-frequency sky surveys, we present a new catalogue of NLSy1
galaxies. This was done by carrying out a detailed decomposition of >2 million
optical spectra of quasars and galaxies from the Sloan Digital Sky Survey Data
Release 17 (SDSS-DR17) using the publicly available software "Bayesian AGN
Decomposition Analysis for SDSS Spectra". The catalogue contains 22656 NLSy1
galaxies which is more than twice the size of the previously identified NLSy1s
based on SDSS-DR12. As a corollary, we also release a new catalogue of 52273
broad-line Seyfert 1 (BLSy1) galaxies. The estimated optical spectral
parameters and derived quantities confirm the previously known finding of NLSy1
galaxies being AGN powered by highly accreting, low-mass black holes. We
conclude that this enlarged sample of NLSy1 and BLSy1 galaxies will enable us
to explore the low-luminosity end of the AGN population by effectively
utilizing the sensitive, high-quality observations delivered by
ongoing/upcoming wide-field sky surveys. The catalogue has been made public at
https://www.ucm.es/blazars/seyfert
