[DPE-7316] Stereo mode - split watcher charm

.github/CODEOWNERS

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+* @canonical/data-postgresql

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: File a bug report
+labels: bug
+
+---
+
+<!-- Thank you for submitting a bug report! All fields are required unless marked optional. -->
+
+## Steps to reproduce
+<!-- Please enable debug logging by running `juju model-config logging-config="<root>=INFO;unit=DEBUG"` (if possible) -->
+1. 
+
+## Expected behavior
+
+
+## Actual behavior
+<!-- If applicable, add screenshots -->
+
+
+## Versions
+
+<!-- Run `lsb_release -sd` -->
+Operating system: 
+
+<!-- Run `juju version` -->
+Juju CLI: 
+
+<!-- Model version from `juju status` -->
+Juju agent: 
+
+<!-- App revision from `juju status` or (advanced) commit hash -->
+Charm revision: 
+
+<!-- Run `lxd version` -->
+LXD: 
+
+## Log output
+<!-- Please enable debug logging by running `juju model-config logging-config="<root>=INFO;unit=DEBUG"` (if possible) -->
+<!-- Then, run `juju debug-log --replay > log.txt` and upload "log.txt" file here -->
+Juju debug log: 
+
+<!-- (Optional) Copy the logs that are relevant to the bug & paste inside triple backticks below -->
+
+
+## Additional context
+<!-- (Optional) Add any additional information here -->

.github/pull_request_template.md

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+## Issue
+
+## Solution
+
+## Checklist
+- [ ] I have added or updated any relevant documentation.
+- [ ] I have cleaned any remaining cloud resources from my accounts.

.github/release.yaml

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+changelog:
+  categories:
+    - title: Features
+      labels:
+        - enhancement
+    - title: Bug fixes
+      labels:
+        - bug

.github/renovate.json5

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+{
+  $schema: 'https://docs.renovatebot.com/renovate-schema.json',
+  extends: [
+    'github>canonical/data-platform//renovate_presets/charm.json5',
+  ],
+  reviewers: [
+    'team:data-postgresql',
+  ],
+  baseBranchPatterns: [
+    '/^*\\/edge$/',
+  ],
+  packageRules: [
+  ],
+  customManagers: [],
+}

.github/workflows/approve_renovate_pr.yaml

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+# Copyright 2025 Canonical Ltd.
+# See LICENSE file for licensing details.
+name: Approve Renovate pull request
+
+on:
+  pull_request:
+    types:
+      - opened
+
+jobs:
+  approve-pr:
+    name: Approve Renovate pull request
+    uses: canonical/data-platform-workflows/.github/workflows/approve_renovate_pr.yaml@v49.0.1
+    permissions:
+      pull-requests: write  # Needed to approve PR

.github/workflows/check_pr.yaml

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+# Copyright 2025 Canonical Ltd.
+# See LICENSE file for licensing details.
+name: Check pull request
+
+on:
+  pull_request:
+    types:
+      - opened
+      - labeled
+      - unlabeled
+      - edited
+    branches:
+      - main
+      - '*/edge'
+
+jobs:
+  check-pr:
+    name: Check pull request
+    uses: canonical/data-platform-workflows/.github/workflows/check_charm_pr.yaml@v49.0.1
+    permissions: {}

.github/workflows/ci.yaml

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+# Copyright 2022 Canonical Ltd.
+# See LICENSE file for licensing details.
+name: Tests
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  pull_request:
+    paths-ignore:
+      - '.gitignore'
+      - '.jujuignore'
+      - 'LICENSE'
+      - '**.md'
+      - .github/renovate.json5
+      - 'docs/**'
+      - 'terraform/**'
+  # Triggered on schedule by .github/workflows/scheduled_ci_*.yaml on default branch
+  workflow_dispatch:
+  # Triggered on push by .github/workflows/release.yaml
+  workflow_call:
+    outputs:
+      artifact-prefix:
+        description: build_charm.yaml `artifact-prefix` output
+        value: ${{ jobs.build.outputs.artifact-prefix }}
+
+jobs:
+  lint-workflows:
+    name: Lint .github/workflows/
+    uses: canonical/data-platform-workflows/.github/workflows/lint_workflows.yaml@v49.0.1
+    permissions:
+      contents: read
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+      - name: Install tox & poetry
+        run: |
+          pipx install tox
+          pipx install poetry
+      - name: tox run -e lint
+        run: tox run -e lint
+    permissions: {}
+
+  unit-test:
+    name: Unit test charm
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+      - name: Install tox & poetry
+        run: |
+          pipx install tox
+          pipx install poetry
+      - name: Run tests
+        run: tox run -e unit
+    permissions: {}
+
+  build:
+    name: Build charm
+    uses: canonical/data-platform-workflows/.github/workflows/build_charm.yaml@v49.0.1
+    with:
+      cache: false
+    permissions:
+      actions: read  # Needed for GitHub API call to get workflow version
+      contents: read
+
+  integration-test:
+    name: Integration test charm
+    needs:
+      - lint-workflows
+      - lint
+      - unit-test
+      - build
+    uses: ./.github/workflows/integration_test.yaml
+    with:
+      artifact-prefix: ${{ needs.build.outputs.artifact-prefix }}
+    permissions:
+      contents: write  # Needed for Allure Report