Reverse zones made easy: suggested, filled, in the right view, PTRs kept in step

Missing reverse zones are suggested for the private views' A and AAAA records (/24 for private IPv4, /32 for a public address, /48 for IPv6) and created filled with PTR records (jarl zone suggest-reverse, the Zones page). zone create --fill and zone fill-ptr add the PTRs a reverse zone lacks; a reverse zone created without a view goes to the private view using its addresses. Per zone, auto_ptr keeps the PTR records of A and AAAA records in step on every change (database version 12). Zone commands take a network.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,35 @@ All notable changes to Jarl are documented here. The format follows
 
 ## [Unreleased]
 
+### Added
+
+- Reverse zones made easy (docs/reverse.md):
+  - **Missing reverse zones**: the Zones page and `jarl zone
+    suggest-reverse` list the reverse zones the private views lack for
+    their A and AAAA records' addresses: the /24 of a private IPv4 network,
+    a /32 for a public address (the rest of its /24 belongs to others),
+    the /48 of IPv6 addresses. Create one, or all (`--create`), filled.
+  - **Fill**: `jarl zone create 10.0.10.0/24 --fill` (ticked in the New
+    zone dialog) adds a PTR record for each address the view's records use
+    there; `jarl zone fill-ptr` and the reverse zone's page add the ones
+    missing later. An address with several names gets its mail or name
+    server's name, else a host's.
+  - **The right view**: a reverse zone created without a view goes to the
+    private view whose records use its addresses.
+  - **PTR records kept in step** per zone (`jarl zone update ZONE
+    --auto-ptr`, zone settings → Reverse DNS): adding, changing,
+    disabling or deleting an A or AAAA record does the same to its PTR
+    record, as the Update PTR box does for one change.
+- Zone commands take a network for a reverse zone: `jarl zone show
+  10.0.10.0/24`.
+
+### Upgrading
+
+- The database gets a new version (12), applied when jarld starts; a
+  0.5 jarld can't open it afterwards, so take a backup first (`sudo
+  jarld backup`). Nothing changes until you turn `auto_ptr` on for a
+  zone.
+
 ## [0.5.2] - 2026-10-12
 
 ### Added