wiki: switch to migrated pg

wiki/application.yaml

@@ -84,20 +84,23 @@ spec:
           imagePullPolicy: Always
           env:
             - name: DB_TYPE
-              value: mysql
+              value: postgres
             - name: DB_HOST
-              value: mariadb
+              value: postgres
             - name: DB_PORT
-              value: "3306"
+              value: "5432"
             - name: DB_USER
-              value: wiki
+              value: kspace_wiki
             - name: DB_NAME
-              value: wiki
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.namespace
             - name: DB_PASS
               valueFrom:
                 secretKeyRef:
-                  name: mariadb-secrets
-                  key: MYSQL_PASSWORD
+                  name: postgres-appuser-password
+                  key: password
+
           ports:
             - containerPort: 3000
               name: http

wiki/mariadb.yaml

@@ -1,3 +1,4 @@
+#TODO: delete me after 2026-04 (residual from migration to postgres)
 ---
 apiVersion: apps/v1
 kind: StatefulSet
@@ -9,7 +10,7 @@ spec:
   selector:
     matchLabels:
       app: mariadb
-  replicas: 1
+  replicas: 0
   template:
     metadata:
       labels: