diff --git a/.github/workflows/coverage_comment.yml b/.github/workflows/coverage_comment.yml
new file mode 100644
index 000000000000..d63e6f4a75ad
--- /dev/null
+++ b/.github/workflows/coverage_comment.yml
@@ -0,0 +1,72 @@
+name: Coverage Comment
+
+on:
+  workflow_run:
+    workflows: ["Coverage Tests"]
+    types:
+      - completed
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  comment:
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success' &&
+      github.repository == 'django/django' &&
+      github.event.workflow_run.pull_requests[0] != null
+    name: Post Coverage Comment
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - name: Download diff coverage report
+        uses: actions/download-artifact@v4
+        with:
+          name: diff-coverage-report-${{ github.event.workflow_run.pull_requests[0].number }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+
+      - name: Post/update PR comment
+        env:
+          PR_NUMBER: ${{ github.event.workflow_run.pull_requests[0].number }}
+        uses: actions/github-script@v8
+        with:
+          script: |
+            const fs = require('fs');
+            const reportPath = 'diff-cover-report.md';
+            let body = 'No coverage data available.';
+            if (fs.existsSync(reportPath)) {
+              body = fs.readFileSync(reportPath, 'utf8');
+            }
+            const commentBody = '### 📊 Coverage Report for Changed Files\n\n```\n' + body + '\n```\n\n**Note:** Missing lines are warnings only. Some lines may not be covered by SQLite tests as they are database-specific.\n\nFor more information about code coverage on pull requests, see the [contributing documentation](https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/#code-coverage-on-pull-requests).';
+
+            const prNumber = parseInt(process.env.PR_NUMBER);
+            if (isNaN(prNumber)) {
+              core.setFailed('PR number is not available or invalid.');
+              return;
+            }
+            
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber,
+            });
+            
+            for (const c of comments) {
+              if ((c.body || '').includes('📊 Coverage Report for Changed Files')) {
+                await github.rest.issues.deleteComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  comment_id: c.id,
+                });
+              }
+            }
+
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber,
+              body: commentBody,
+            });
diff --git a/.github/workflows/coverage_tests.yml b/.github/workflows/coverage_tests.yml
new file mode 100644
index 000000000000..af463bb29502
--- /dev/null
+++ b/.github/workflows/coverage_tests.yml
@@ -0,0 +1,75 @@
+name: Coverage Tests
+
+on:
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '**/*.md'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  coverage:
+    if: github.repository == 'django/django'
+    name: Coverage Tests (Windows)
+    runs-on: windows-latest
+    timeout-minutes: 60
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.14'
+          cache: 'pip'
+          cache-dependency-path: 'tests/requirements/py3.txt'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip wheel
+          python -m pip install -r tests/requirements/py3.txt -e .
+          python -m pip install 'coverage[toml]' diff-cover
+
+      - name: Run tests with coverage
+        env:
+          PYTHONPATH: ${{ github.workspace }}/tests
+          COVERAGE_PROCESS_START: ${{ github.workspace }}/tests/.coveragerc
+          RUNTESTS_DIR: ${{ github.workspace }}/tests
+        run: |
+          python -Wall tests/runtests.py -v2
+
+      - name: Generate coverage report
+        if: success()
+        env:
+          COVERAGE_RCFILE: ${{ github.workspace }}/tests/.coveragerc
+          RUNTESTS_DIR: ${{ github.workspace }}/tests
+        run: |
+          python -m coverage combine
+          python -m coverage report --show-missing
+          python -m coverage xml -o tests/coverage.xml
+
+      - name: Generate diff coverage report
+        if: success()
+        run: |
+          if (Test-Path 'tests/coverage.xml') {
+            diff-cover tests/coverage.xml --compare-branch=origin/main --fail-under=0 > diff-cover-report.md
+          } else {
+            Set-Content -Path diff-cover-report.md -Value 'No coverage data available.'
+          }
+
+      - name: Upload diff coverage report
+        if: success()
+        uses: actions/upload-artifact@v4
+        with:
+          name: diff-coverage-report-${{ github.event.pull_request.number }}
+          path: diff-cover-report.md
+          retention-days: 1
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b709ed514540..079fae63283c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -19,6 +19,7 @@ permissions:
 
 jobs:
   windows:
+    if: github.event_name == 'push'
     runs-on: windows-latest
     strategy:
       matrix:
diff --git a/django/db/backends/base/features.py b/django/db/backends/base/features.py
index 1e957d105ed3..38af239cbe75 100644
--- a/django/db/backends/base/features.py
+++ b/django/db/backends/base/features.py
@@ -415,6 +415,10 @@ class BaseDatabaseFeatures:
     # Does the Round() database function round to even?
     rounds_to_even = False
 
+    # Should dollar signs be prohibited in column aliases to prevent SQL
+    # injection?
+    prohibits_dollar_signs_in_column_aliases = False
+
     # A set of dotted paths to tests in Django's test suite that are expected
     # to fail on this database.
     django_test_expected_failures = set()
diff --git a/django/db/backends/postgresql/compiler.py b/django/db/backends/postgresql/compiler.py
index 08d78e333a5d..48d0ccfd9d06 100644
--- a/django/db/backends/postgresql/compiler.py
+++ b/django/db/backends/postgresql/compiler.py
@@ -1,6 +1,6 @@
 from django.db.models.sql.compiler import (  # isort:skip
     SQLAggregateCompiler,
-    SQLCompiler as BaseSQLCompiler,
+    SQLCompiler,
     SQLDeleteCompiler,
     SQLInsertCompiler as BaseSQLInsertCompiler,
     SQLUpdateCompiler,
@@ -25,15 +25,6 @@ def __str__(self):
         return "UNNEST(%s)" % ", ".join(self)
 
 
-class SQLCompiler(BaseSQLCompiler):
-    def quote_name_unless_alias(self, name):
-        if "$" in name:
-            raise ValueError(
-                "Dollar signs are not permitted in column aliases on PostgreSQL."
-            )
-        return super().quote_name_unless_alias(name)
-
-
 class SQLInsertCompiler(BaseSQLInsertCompiler):
     def assemble_as_sql(self, fields, value_rows):
         # Specialize bulk-insertion of literal values through UNNEST to
diff --git a/django/db/backends/postgresql/features.py b/django/db/backends/postgresql/features.py
index 5e4ed320be8e..30d06c95c500 100644
--- a/django/db/backends/postgresql/features.py
+++ b/django/db/backends/postgresql/features.py
@@ -70,6 +70,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_nulls_distinct_unique_constraints = True
     supports_no_precision_decimalfield = True
     can_rename_index = True
+    prohibits_dollar_signs_in_column_aliases = True
     test_collations = {
         "deterministic": "C",
         "non_default": "sv-x-icu",
diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py
index 20f06ad168a8..9068d87a8974 100644
--- a/django/db/models/sql/compiler.py
+++ b/django/db/models/sql/compiler.py
@@ -553,6 +553,14 @@ def quote_name_unless_alias(self, name):
         for table names. This avoids problems with some SQL dialects that treat
         quoted strings specially (e.g. PostgreSQL).
         """
+        if (
+            self.connection.features.prohibits_dollar_signs_in_column_aliases
+            and "$" in name
+        ):
+            raise ValueError(
+                "Dollar signs are not permitted in column aliases on "
+                f"{self.connection.display_name}."
+            )
         if name in self.quote_cache:
             return self.quote_cache[name]
         if (
diff --git a/tests/annotations/tests.py b/tests/annotations/tests.py
index 10cd05db63f4..6336cabafae9 100644
--- a/tests/annotations/tests.py
+++ b/tests/annotations/tests.py
@@ -1545,8 +1545,11 @@ def test_alias_filtered_relation_sql_injection_dollar_sign(self):
         qs = Book.objects.alias(
             **{"crafted_alia$": FilteredRelation("authors")}
         ).values("name", "crafted_alia$")
-        if connection.vendor == "postgresql":
-            msg = "Dollar signs are not permitted in column aliases on PostgreSQL."
+        if connection.features.prohibits_dollar_signs_in_column_aliases:
+            msg = (
+                "Dollar signs are not permitted in column aliases on "
+                f"{connection.display_name}."
+            )
             with self.assertRaisesMessage(ValueError, msg):
                 list(qs)
         else:
diff --git a/zizmor.yml b/zizmor.yml
index 76e53f73cc29..23630337b48c 100644
--- a/zizmor.yml
+++ b/zizmor.yml
@@ -1,6 +1,7 @@
 rules:
   dangerous-triggers:
     ignore:
+      - coverage_comment.yml
       - labels.yml
       - new_contributor_pr.yml
   unpinned-uses: