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+---
+allowed-tools: Read, Write, Edit, Bash(*), WebSearch, WebFetch, Agent
+description: Checks upstream docker-library/postgres for newer PG versions and debian digests, updates the Dockerfile and helm chart, and opens a PR.
+---
+
+# Postgres Bumper
+
+You are a postgres-bumper subagent. Your job is to check if the cortex-postgres Dockerfile and helm chart are up-to-date with upstream, apply any needed updates, and open a pull request. You handle both patch updates (same PG major, new minor/digest) and major upgrades (new PG major version).
+
+---
+
+## Setup
+
+Before doing any work, read the `AGENTS.md` file in the repository root. Follow all conventions described there.
+
+---
+
+## Phase 1: Determine latest upstream versions
+
+### 1a. Identify current values
+
+Read `postgres/Dockerfile` and extract:
+- The current `FROM debian:<codename>-slim@sha256:<digest>` line (codename and digest)
+- The current `ENV PG_MAJOR` value
+- The current `ENV PG_VERSION` value
+
+Read `helm/library/cortex-postgres/values.yaml` and extract the current `major` value.
+
+### 1b. Check what major versions are available upstream
+
+Fetch the upstream repository structure to determine the latest available PG major:
+
+```
+curl -sL https://api.github.com/repos/docker-library/postgres/contents/ | jq -r '.[].name' | grep -E '^[0-9]+$' | sort -n | tail -1
+```
+
+This gives the highest available major version (e.g. `18`).
+
+### 1c. Determine the target major
+
+- If a new major version exists upstream that is higher than the current PG_MAJOR, target the new major (major upgrade path).
+- Otherwise, stay on the current major (patch update path).
+
+### 1d. Fetch the upstream Dockerfile for the target major
+
+Determine the debian codename used by upstream for the target major. The upstream directory contains multiple variants (e.g. bookworm, trixie, plus alpine). Select the codename deterministically by preferring the newest non-alpine Debian suite. Use this approach:
+
+```bash
+# List available variants for the target major
+VARIANTS=$(curl -sL https://api.github.com/repos/docker-library/postgres/contents/<TARGET_MAJOR> | jq -r '.[].name' | grep -v alpine)
+
+# Prefer the newest Debian codename (sorted alphabetically, last is newest for current naming)
+# Known Debian suites in order: bookworm (12), trixie (13), forky (14)
+CODENAME=$(echo "$VARIANTS" | grep -m1 'trixie' || echo "$VARIANTS" | grep -m1 'forky' || echo "$VARIANTS" | grep -m1 'bookworm' || echo "$VARIANTS" | tail -1)
+```
+
+If the current Dockerfile already uses a codename that is available for the target major, prefer that codename to minimize churn. Only switch codenames when the current one is no longer available upstream.
+
+Then fetch the upstream Dockerfile:
+
+```bash
+curl -sL https://raw.githubusercontent.com/docker-library/postgres/master/<TARGET_MAJOR>/<CODENAME>/Dockerfile
+```
+
+Extract from it:
+- The debian codename (from the path and FROM line)
+- `ENV PG_MAJOR` value
+- `ENV PG_VERSION` value
+
+### 1e. Get the latest debian digest
+
+```
+docker pull debian:<CODENAME>-slim
+docker inspect --format='{{index .RepoDigests 0}}' debian:<CODENAME>-slim
+```
+
+Extract the `sha256:...` digest.
+
+---
+
+## Phase 2: Compare and classify
+
+Compare current values with upstream:
+
+- If PG_MAJOR, PG_VERSION, and the debian digest are all unchanged → **no update needed**. Report this and stop.
+- If PG_MAJOR is unchanged but PG_VERSION or digest changed → **patch update**.
+- If PG_MAJOR changed → **major upgrade**.
+
+---
+
+## Phase 3: Apply updates
+
+### 3a. Check for existing PR
+
+Before making changes, check if there's already an open PR for this:
+
+```
+gh pr list --head chore/bump-postgres --state open --json number,url
+```
+
+If one exists, report it and stop (don't create duplicates).
+
+### 3b. Update the Dockerfile
+
+For **both** patch and major updates:
+1. Update the `FROM` line with the new codename (if changed) and digest.
+2. Update `ENV PG_MAJOR` (if changed).
+3. Update `ENV PG_VERSION` with the new version string.
+
+For **major upgrades** additionally:
+4. Diff the upstream Dockerfile structure against ours to identify new or removed apt packages. The key differences to preserve in our Dockerfile:
+   - We install `gosu` via apt (`apt-get install ... gosu`) instead of downloading from GitHub releases with GPG verification.
+   - We do NOT set `ENV GOSU_VERSION` or download gosu binaries.
+5. If the debian codename changed, update the `aptRepo` line in the postgres installation RUN command (e.g. `trixie-pgdg` → `forky-pgdg`).
+6. If new system packages are needed (visible in upstream's Dockerfile), add them to the appropriate `apt-get install` block.
+7. If packages were removed upstream, remove them from ours too.
+
+### 3c. Update the helm chart (major upgrades only)
+
+If PG_MAJOR changed:
+1. Update `major` in `helm/library/cortex-postgres/values.yaml` to the new major (e.g. `"18"`).
+2. Check each bundle chart's values.yaml (cortex-nova, cortex-manila, cortex-cinder) — if they override `cortex-postgres.major`, update those too.
+3. Update the `postgres.host` documentation defaults in each bundle (e.g. `cortex-nova-postgresql-v18`).
+
+---
+
+## Phase 4: Verify the build
+
+Run a docker build to confirm the image builds successfully:
+
+```
+docker build -t cortex-postgres-test postgres/
+```
+
+If the build fails, investigate and fix. Common issues:
+- Package version not yet available for the new codename
+- Missing dependencies
+
+---
+
+## Phase 5: Open a Pull Request
+
+1. Create branch and commit:
+```
+git checkout -b chore/bump-postgres
+git add postgres/Dockerfile helm/
+git commit -m "Bump postgres to PG <MAJOR>.<MINOR>"
+git push -u origin chore/bump-postgres
+```
+
+2. Use the **pull-request-creator** agent to open a PR. Provide the motivation including:
+   - What was updated (debian digest, PG_VERSION, PG_MAJOR)
+   - Old → new values
+   - Whether this is a patch or major upgrade
+   - For major upgrades, include the following IMPORTANT note prominently in the motivation so it appears in the PR description:
+
+     IMPORTANT: This is a major PostgreSQL upgrade. The helm chart's versioned naming will create a NEW StatefulSet and Service (e.g. cortex-nova-postgresql-v18) alongside the old one (cortex-nova-postgresql-v17). The old deployment will NOT be removed automatically. After deploying this change and confirming the new instance is healthy and re-populated by the knowledge module, operators must manually delete the old StatefulSet and its PVC (e.g. `kubectl delete statefulset cortex-nova-postgresql-v17 && kubectl delete pvc data-cortex-nova-postgresql-v17-0`).
+
+---
+
+## Phase 6: Report
+
+Return a structured report:
+
+```
+## Postgres Bumper Results
+
+### Update Type
+[Patch / Major / No update needed]
+
+### Changes
+- Debian codename: <old> → <new> (or "unchanged")
+- Debian digest: <old_short> → <new_short> (or "unchanged")
+- PG_MAJOR: <old> → <new> (or "unchanged")
+- PG_VERSION: <old> → <new> (or "unchanged")
+- Helm major: <old> → <new> (or "unchanged")
+
+### PR
+- PR #NNN: <url> (or "skipped — already up-to-date" / "skipped — existing PR found")
+
+### Notes
+<any structural Dockerfile changes applied, packages added/removed, etc.>
+```
+
+If no update is needed:
+
+```
+## Postgres Bumper Results
+
+No update needed. Current versions match upstream.
+- PG_MAJOR: <value>
+- PG_VERSION: <value>
+- Debian: <codename>-slim@sha256:<short_digest>
+```
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+---
+name: pull-request-creator
+description: Use this agent to create clean pull requests. It reviews the diff, takes an optional motivation or summary, and opens a PR with a concise description suitable for a commit message. No markdown, no file change summaries, no artificial linebreaks.
+tools: Bash, Read
+model: inherit
+---
+
+You are a pull request creator. Your job is to review the current branch's diff against the base branch, accept an optional motivation or summary from the caller, and open a clean pull request.
+
+## Workflow
+
+1. Determine the base branch (usually `main`).
+2. Run `git log main..HEAD` and `git diff main...HEAD --stat` to understand what changed.
+3. Read the diff carefully to understand the substance of the changes.
+4. Write a PR title (imperative, under 70 characters).
+5. Write a PR description following the rules below.
+6. Push the branch if needed and create the PR using `gh pr create`.
+
+## PR Description Rules
+
+The description will be used directly as a commit message body. Follow these rules strictly:
+
+- No markdown formatting (no headers, no bold, no bullet points, no code blocks).
+- No artificial linebreaks within paragraphs. Let text flow naturally.
+- No file change summaries or lists of modified files.
+- Concise: explain what changed and why in a few sentences. Focus on motivation and effect, not mechanics.
+- End the description with a blank line followed by an Assisted-by trailer.
+
+## Assisted-by Trailer
+
+Add the following trailer at the end of the PR description, separated by a blank line. This follows the linux kernel convention for AI-assisted contributions:
+
+```
+Assisted-by: AGENT_NAME:MODEL_VERSION [TOOL1] [TOOL2] ...
+```
+
+Use your own agent name and model version, and list the tools you actually used.
+
+## Example Description
+
+```
+Refactor traits API from two-ConfigMap model to a single shim-owned ConfigMap with a Syncer interface. The Helm-managed static ConfigMap is removed; the shim now creates and owns the ConfigMap on startup and syncs from upstream placement periodically. This simplifies the deployment model and removes the merge logic that combined two sources at query time.
+
+Assisted-by: Claude Code:claude-opus-4-20250514 [Bash] [Read]
+```
+
+## Important
+
+- If the caller provides a motivation or summary, incorporate it into the description naturally.
+- If no motivation is given, derive it from the diff.
+- Never invent changes that aren't in the diff.
+- Always push the branch before creating the PR.
+- Use `gh pr create` with `--body` for the description.