docs: simplify Docker image pinning documentation

mintlify/get-started/self-host/production-setup.mdx

@@ -26,13 +26,20 @@ Teams that frequently work with large SQL files may need more.
 
 ## Production Setup Checklist
 
-### Prerequisites
+### Essential Configuration
 
 - Review system requirements (see above)
 - [Configure External PostgreSQL](/get-started/self-host/external-postgres/)
 - [Configure External Access](/get-started/self-host/external-access)
 - [Configure External URL](/get-started/self-host/external-url)
 - Pin Docker image to specific version instead of `latest` ([changelog](https://docs.bytebase.com/changelog))
+
+  While version tags like `3.7.0` are better than `latest`, Bytebase may still add patches to existing versions. For a truly fixed version, use the SHA256 digest from [Docker Hub](https://hub.docker.com/r/bytebase/bytebase/tags).
+
+  ```bash
+  # Pin to exact image using digest (prevents any updates)
+  docker pull bytebase/bytebase:3.7.0@sha256:00b436855b08739aad02fd52e41b5d74c03db9c70c49ce5de42376347cd1403c
+  ```
 
 ### Monitoring
 

mintlify/get-started/self-host/upgrade.mdx

@@ -73,18 +73,8 @@ psql -h <<host>> -p <<port>> -U <<user>> postgres -c "DROP DATABASE metadb_old"
 
 #### Restore Option 2 - Restore to a different database `metadb2`
 
-##### Step 1 - Modify the dump file
 
-The dump file records the Bytebase metadata schema change history, and it's database specific. So we
-need to change the existing record value from `metadb` to `metadb2` first, which means to transfer
-the change history to `metadb2`.
-
-Locate the `migration_history` table in the dump file, and for each record, find the value `metadb`
-which corresponds to the `namespace` column, change each occurrence from `metadb` to `metadb2`.
-
-![change-migration-history](/content/docs/administration/back-up-data/change-migration-history.webp)
-
-##### Step 2 - Restore metadata to `metadb2`
+##### Step 1 - Restore metadata to `metadb2`
 
 Create a new db `metadb2`:
 
@@ -98,7 +88,7 @@ Restore metadata to the new db:
 psql -h <<host>> -p <<port>> -U <<user>> metadb2 < metadb.sql
 ```
 
-##### Step 3 - Drop the old metadata db
+##### Step 2 - Drop the old metadata db
 
 Restart Bytebase and verify the metadata is restored properly. Afterwards, you can drop the old database:
 
@@ -147,91 +137,3 @@ Take Docker as an example (**follow the below steps exactly**):
 
    <TerminalDockerRunVolume />
 
-## Version Management
-
-Bytebase adopts [Semantic Versioning](https://semver.org/) using the MAJOR.MINOR.PATCH format.
-
-Bytebase ties the version number with the underlying database schema progression, because:
-
-1. Schema change is a good approximate to the functional change. Large schema changes often indicate large functional changes.
-1. Schema change determines the customer involvement when upgrading to the new version.
-
-   - `MAJOR` version change usually happens once a year. It _might_ require manual effort from the customer. Bytebase will
-     try to avoid that if possible.
-   - `MINOR` version is changed when the underlying database schema changes. While the upgrade does not require customer involvement. `MINOR` version change usually happens about once every month.
-   - `PATCH` version is changed when the new version does not include underlying database schema changes. `PATCH` version change usually happens bi-weekly following our release schedule.
-
-## Docker Image Version
-
-Certain changes maybe cherry-picked into the existing version. So when Bytebase starts next time, it will self-upgrade.
-If you don't want this behavior, you could use the image digest to pin the exact commit. For example,
-
-```bash
-# https://hub.docker.com/repository/docker/bytebase/bytebase/tags/3.7.0/sha256-29be3c651d4fc93c6aab37046b41128015a9be5d6f02b2490353962c469c5110
-docker pull bytebase/bytebase:3.7.0@sha256:00b436855b08739aad02fd52e41b5d74c03db9c70c49ce5de42376347cd1403c
-```
-
-The docker image is built with [OpenContainers Annotations](https://specs.opencontainers.org/image-spec/annotations/):
-
-```bash
-docker inspect bytebase/bytebase:3.7.0 | jq -r '.[0].Config.Labels'
-{
-  "org.opencontainers.image.revision": "fb430b0626c33d3431e750dc0cc446f3c8a434a8",
-  "org.opencontainers.image.version": "3.7.0"
-}
-
-# Digest also works
-docker inspect bytebase/bytebase:3.7.0@sha256:00b436855b08739aad02fd52e41b5d74c03db9c70c49ce5de42376347cd1403c | jq -r '.[0].Config.Labels'
-{
-  "org.opencontainers.image.revision": "ec5d81d554287258095377c076528d8ab6664fa0",
-  "org.opencontainers.image.version": "3.7.0"
-}
-```
-
-- `org.opencontainers.image.revision` is the git commit hash, in the example, it corresponds to the [particular git commit](https://github.com/bytebase/bytebase/commit/fb430b0626c33d3431e750dc0cc446f3c8a434a8)
-- `org.opencontainers.image.version` is the release version, in the example, it corresponds to the [3.7.0 release branch](https://github.com/bytebase/bytebase/commits/release/3.7.0).
-
-If you want to check the commit history for the image, the best way is to visit the release branch page and locate the commit:
-
-![release-commit](/content/docs/get-started/upgrade/release-commit.webp)
-
-## Upgrade from Old Version
-
-To upgrade, replace the version string with the target version and restart. Bytebase will self-upgrade automatically.
-
-### Upgrade from 1.x or 2.x
-
-First upgrade to 2.1.0 and then follow the next section.
-
-### Upgrade from 3.0.0 ~ 3.3.0
-
-First upgrade to 3.3.1 and then follow the next section.
-
-### Upgrade from 3.3.1
-
-Replace the version string with the latest version and restart.
-
-## Downgrade
-
-<Warning>
-  Downgrade is as dangerous as upgrade, we highly recommend you verify the downgrade in a test
-  environment first.
-</Warning>
-
-### Downgrade PATCH Version
-
-Downgrades carry the same risks as upgrades, so validate any downgrade in a test environment before proceeding.
-
-### Downgrade MINOR Version
-
-Minor version upgrade/downgrade involves metadata schema change, so we must restore the metadata database to the old version first.
-Thus the metadata backup for the old version must be available.
-
-1. Stop Bytebase
-1. Restore the metadata database with the metadata backup
-1. Replace the version with the old version.
-1. Start Bytebase
-
-### Downgrade MAJOR Version
-
-Not supported