Gate a restore on every schema chain, not just the core one

The compatibility gate read alembic_version and nothing else, but plugin schemas
move independently of core. Roll the code back to an older plugin revision and
the core head can be identical, so a dump carrying plugin tables the code has
never heard of passed the gate, loaded - destroying what was there - and only
then failed in 'flask plugin upgrade-all' with "Can't locate revision". A failed
restore that has already replaced what it was restoring over is the worst
outcome this feature can produce, and it was reachable from an ordinary rollback.

Backups now stamp the applied revision of every alembic_version_<plugin> table
alongside the core one, read from the dumped database the same way. restore.sh
checks each against that plugin's own versions directory and refuses before
touching anything, naming the plugin and the revision to deploy past. A plugin
in the dump that this build does not have at all is refused for the same reason.
The list endpoint's compatibility badge asks the same question, so the UI cannot
offer a set the restore will reject.

Sets taken before the stamp existed carry no dataplugins and keep their old
core-only verdict. Their plugin revisions are unknowable, and making every
existing set unrestorable to close this would be a worse trade than the gap.

Proven against a real stack, reproducing the exact case: core head identical,
endpoints data stamped at a revision the build does not have. The restore
refused, the live row was still there afterwards, and it stopped early enough
that the pre-restore safety copy was never needed. The same set with its true
revision restored normally.

Suite 2605 passed / 9 skipped, with the gate covered both ways plus the legacy
fallback.

Scope: product

scripts/backup/backup.sh

@@ -75,6 +75,39 @@ DATAREV="$(mysql \
 	"${MYSQL_DATABASE}" 2>/dev/null | tr -d '\r')"
 [ -n "${DATAREV}" ] || log "WARN could not read alembic_version - datarev will be empty"
 
+# The same question for every PLUGIN chain. Each plugin owns an
+# alembic_version_<plugin> table, and those move independently of the core one:
+# code rolled back to an older plugin revision can sit at an identical core
+# head while the dump carries plugin tables it has never heard of. Stamping only
+# the core revision let that combination pass the restore gate, load, and then
+# fail during the plugin upgrade with the data already replaced. Read straight
+# from the dumped DB, same as the core revision above.
+log "reading applied plugin revisions (alembic_version_*)"
+DATAPLUGINS="$(mysql \
+	--host="${MYSQL_HOST}" \
+	--user="${MYSQL_USER}" \
+	--password="${MYSQL_PASSWORD}" \
+	--skip-column-names --batch \
+	-e "SELECT table_name FROM information_schema.tables
+	     WHERE table_schema = '${MYSQL_DATABASE}'
+	       AND table_name LIKE 'alembic\\_version\\_%';" 2>/dev/null \
+	| tr -d '\r' \
+	| while read -r table; do
+		[ -n "${table}" ] || continue
+		plugin="${table#alembic_version_}"
+		rev="$(mysql \
+			--host="${MYSQL_HOST}" \
+			--user="${MYSQL_USER}" \
+			--password="${MYSQL_PASSWORD}" \
+			--skip-column-names --batch \
+			-e "SELECT version_num FROM \`${table}\` LIMIT 1;" \
+			"${MYSQL_DATABASE}" 2>/dev/null | tr -d '\r')"
+		[ -n "${rev}" ] && printf '%s\t%s\n' "${plugin}" "${rev}"
+	 done \
+	| python3 -c 'import json,sys; print(json.dumps(dict(l.rstrip("\n").split("\t",1) for l in sys.stdin if "\t" in l)))')"
+[ -n "${DATAPLUGINS}" ] || DATAPLUGINS='{}'
+log "plugin revisions: ${DATAPLUGINS}"
+
 log "writing manifest"
 python3 /opt/backup/manifest.py \
 	--out "${SETDIR}/manifest.json" \
@@ -82,6 +115,7 @@ python3 /opt/backup/manifest.py \
 	--site "${SITE}" \
 	--imagetag "${SHOPDB_IMAGE_TAG:-source}" \
 	--datarev "${DATAREV}" \
+	--dataplugins "${DATAPLUGINS}" \
 	--migrations /app/migrations \
 	--plugins /app/plugins