Clarify migration steps for overviews table issue

src/server/upgrade/PATCHCreate_ map_overview.sql

@@ -0,0 +1,33 @@
+-- ============================================================
+-- PATCH: Create map_overview table
+-- ============================================================
+
+BEGIN;
+
+CREATE SEQUENCE IF NOT EXISTS public.map_overview_id_seq;
+
+CREATE TABLE IF NOT EXISTS public.map_overview
+(
+    id              INTEGER           NOT NULL DEFAULT nextval('map_overview_id_seq'::regclass),
+    project_id      UUID              NOT NULL,
+    version         CHARACTER VARYING,
+    config          JSON,
+    data_location   CHARACTER VARYING,
+    qgis_file       CHARACTER VARYING,
+
+    CONSTRAINT pk_map_overview
+        PRIMARY KEY (id, project_id),
+
+    CONSTRAINT fk_map_overview_project_id_project
+        FOREIGN KEY (project_id)
+        REFERENCES public.project (id)
+        ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS ix_map_overview_project_id
+    ON public.map_overview (project_id ASC NULLS LAST);
+
+CREATE INDEX IF NOT EXISTS ix_map_overview_version
+    ON public.map_overview (version ASC NULLS LAST);
+
+COMMIT;

src/server/upgrade/index.md

@@ -20,23 +20,23 @@ Make sure to always back up your database data before doing a migration.
 
 Perform the migration:
 
-0. Fix table - migration from old to new MM version
+0. Fix the issue of missing overviews table in case it was not created during older db migration.
 
   ```bash
       $ docker ps -a | grep postgres
   ```
               2b261cd55de2   postgres:14   "docker-entrypoint.s…"   4 weeks ago   Up About a minute  5432/tcp  merginmaps-db
 
+
   ```bash
-      $ docker exec -it  2b261cd55de2 bash
+      $ docker exec -it  merginmaps-db bash
   ```
+  Run commands in postgres container:
+
   ```bash
        psql -U postgres
   ```
 
-  ```bash
-        select * from project;
-  ```
   ```bash
        BEGIN;