Add changelog entry

Co-authored-by: Agustin Mista <agustin.mista@moduscreate.com>
Co-authored-by: Alexander Esgen <alexander.esgen@iohk.io>
Co-authored-by: Georgy Lukyanov <georgy.lukyanov@iohk.io>
Co-authored-by: Thomas BAGREL <thomas.bagrel@tweag.io>
Co-authored-by: Nicolas BACQUEY <nicolas.bacquey@tweag.io>
Co-authored-by: Nicolas "Niols" Jeannerod <nicolas.jeannerod@moduscreate.com>

Author: 6 people

ouroboros-consensus/changelog.d/20250917_101832_thomas.bagrel_peras_cert_db.md

@@ -0,0 +1,24 @@
+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
+
+-->
+
+### Breaking
+
+- Add modules `Ouroboros.Consensus.Storage.PerasCertDB{,.API,.Impl}`, notably defining the types`PerasCertDB`, `PerasCertSnapshot` (read-only snapshot of certs contained in the DB), and `AddPerasCertResult`; alongside their respective methods
+- Add modules `Test.Ouroboros.Storage.PerasCertDB{,.StateMachine,.Model}` for q-s-m testing of the `PerasCertDB` datatype. The corresponding tests are included in the test suite defined by `Test.Ouroboros.Storage`