diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 442c46f96a72..6792c6b824d6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,16 +39,17 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - rdbms: h2
-          - rdbms: hsqldb
-          - rdbms: mysql
-          - rdbms: mariadb
-          - rdbms: postgresql
-          - rdbms: edb
-          - rdbms: oracle
-          - rdbms: db2
-          - rdbms: mssql
-          - rdbms: sybase
+#          - rdbms: h2
+#          - rdbms: hsqldb
+#          - rdbms: mysql
+#          - rdbms: mariadb
+#          - rdbms: postgresql
+#          - rdbms: edb
+#          - rdbms: oracle
+#          - rdbms: db2
+#          - rdbms: mssql
+#          - rdbms: sybase
+          - rdbms: informix
     # Running with CockroachDB requires at least 2-4 vCPUs, which we don't have on GH Actions runners
     #          - rdbms: cockroachdb
     # Running with HANA requires at least 8GB memory just for the database, which we don't have on GH Actions runners
@@ -141,199 +142,3 @@ jobs:
             ./**/target/reports/tests/
       - name: Omit produced artifacts from build cache
         run: ./ci/before-cache.sh
-
-  # Job for builds on Atlas (Oracle) infrastructure.
-  # This is untrusted, even for pushes, see below.
-  atlas:
-    permissions:
-      contents: read
-    name: GraalVM 21 - ${{matrix.rdbms}}
-    #    runs-on: ubuntu-latest
-    runs-on: [ self-hosted, Linux, X64, OCI ]
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - rdbms: oracle_atps
-          - rdbms: oracle_db19c
-          - rdbms: oracle_db21c
-          - rdbms: oracle_db23c
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          persist-credentials: false
-      - name: Reclaim disk space and sanitize user home
-        run: .github/ci-prerequisites-atlas.sh
-      - name: Start database
-        env:
-          RDBMS: ${{ matrix.rdbms }}
-          RUNID: ${{ github.run_number }}
-        run: ci/database-start.sh
-      - name: Set up Java 21
-        uses: graalvm/setup-graalvm@aafbedb8d382ed0ca6167d3a051415f20c859274 # v1.2.8
-        with:
-          distribution: 'graalvm'
-          java-version: '21'
-
-      - name: Generate cache key
-        id: cache-key
-        run: |
-          CURRENT_BRANCH="${{ github.repository != 'hibernate/hibernate-orm' && 'fork' || github.base_ref || github.ref_name }}"
-          CURRENT_MONTH=$(/bin/date -u "+%Y-%m")
-          CURRENT_DAY=$(/bin/date -u "+%d")
-          ROOT_CACHE_KEY="buildtool-cache-atlas"
-          echo "buildtool-monthly-cache-key=${ROOT_CACHE_KEY}-${CURRENT_MONTH}" >> $GITHUB_OUTPUT
-          echo "buildtool-monthly-branch-cache-key=${ROOT_CACHE_KEY}-${CURRENT_MONTH}-${CURRENT_BRANCH}" >> $GITHUB_OUTPUT
-          echo "buildtool-cache-key=${ROOT_CACHE_KEY}-${CURRENT_MONTH}-${CURRENT_BRANCH}-${CURRENT_DAY}" >> $GITHUB_OUTPUT
-      - name: Cache Maven/Gradle Dependency/Dist Caches
-        id: cache-maven
-        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
-        # if it's not a pull request, we restore and save the cache
-        if: github.event_name != 'pull_request'
-        with:
-          path: |
-            ~/.m2/repository/
-            ~/.m2/wrapper/
-            ~/.gradle/caches/modules-2
-            ~/.gradle/wrapper/
-          # A new cache will be stored daily. After that first store of the day, cache save actions will fail because the cache is immutable but it's not a problem.
-          # The whole cache is dropped monthly to prevent unlimited growth.
-          # The cache is per branch but in case we don't find a branch for a given branch, we will get a cache from another branch.
-          key: ${{ steps.cache-key.outputs.buildtool-cache-key }}
-          restore-keys: |
-            ${{ steps.cache-key.outputs.buildtool-monthly-branch-cache-key }}-
-            ${{ steps.cache-key.outputs.buildtool-monthly-cache-key }}-
-      - name: Restore Maven/Gradle Dependency/Dist Caches
-        uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
-        # if it a pull request, we restore the cache but we don't save it
-        if: github.event_name == 'pull_request'
-        with:
-          path: |
-            ~/.m2/repository/
-            ~/.m2/wrapper/
-            ~/.gradle/caches/modules-2
-            ~/.gradle/wrapper/
-          key: ${{ steps.cache-key.outputs.buildtool-cache-key }}
-          restore-keys: |
-            ${{ steps.cache-key.outputs.buildtool-monthly-branch-cache-key }}-
-            ${{ steps.cache-key.outputs.buildtool-monthly-cache-key }}-
-
-      - name: Run build script
-        env:
-          RDBMS: ${{ matrix.rdbms }}
-          RUNID: ${{ github.run_number }}
-          # These runners have no HOME variable set by default, we need to explicitly set it to make the build work
-          HOME: /root
-          # Needed for TFO (TCP fast open)
-          LD_PRELOAD: /home/opc/libtfojdbc1.so
-          LD_LIBRARY_PATH: /home/opc
-        run: ./ci/build-github.sh
-        shell: bash
-      # Upload build scan data.
-      # The actual publishing must be done in a separate job (see ci-report.yml).
-      # We don't write to the remote cache as that would be unsafe.
-      # That's even on push, because we do not trust Atlas runners to hold secrets: they are shared infrastructure.
-      - name: Upload GitHub Actions artifact for the Develocity build scan
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
-        if: "${{ !cancelled() }}"
-        with:
-          name: build-scan-data-${{ matrix.rdbms }}
-          path: ~/.gradle/build-scan-data
-      - name: Upload test reports (if Gradle failed)
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
-        if: failure()
-        with:
-          name: test-reports-java11-${{ matrix.rdbms }}
-          path: |
-            ./**/target/reports/tests/
-      - name: Omit produced artifacts from build cache
-        run: ./ci/before-cache.sh
-
-  # Static code analysis check
-  format_checks:
-    permissions:
-      contents: read
-    name: Static code analysis
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        with:
-          persist-credentials: false
-      - name: Reclaim disk space and sanitize user home
-        run: .github/ci-prerequisites-atlas.sh
-      - name: Set up Java 21
-        uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
-        with:
-          distribution: 'temurin'
-          java-version: '21'
-
-      - name: Generate cache key
-        id: cache-key
-        run: |
-          CURRENT_BRANCH="${{ github.repository != 'hibernate/hibernate-orm' && 'fork' || github.base_ref || github.ref_name }}"
-          CURRENT_MONTH=$(/bin/date -u "+%Y-%m")
-          CURRENT_DAY=$(/bin/date -u "+%d")
-          ROOT_CACHE_KEY="buildtool-cache-atlas"
-          echo "buildtool-monthly-cache-key=${ROOT_CACHE_KEY}-${CURRENT_MONTH}" >> $GITHUB_OUTPUT
-          echo "buildtool-monthly-branch-cache-key=${ROOT_CACHE_KEY}-${CURRENT_MONTH}-${CURRENT_BRANCH}" >> $GITHUB_OUTPUT
-          echo "buildtool-cache-key=${ROOT_CACHE_KEY}-${CURRENT_MONTH}-${CURRENT_BRANCH}-${CURRENT_DAY}" >> $GITHUB_OUTPUT
-      - name: Cache Maven/Gradle Dependency/Dist Caches
-        id: cache-maven
-        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
-        # if it's not a pull request, we restore and save the cache
-        if: github.event_name != 'pull_request'
-        with:
-          path: |
-            ~/.m2/repository/
-            ~/.m2/wrapper/
-            ~/.gradle/caches/modules-2
-            ~/.gradle/wrapper/
-          # A new cache will be stored daily. After that first store of the day, cache save actions will fail because the cache is immutable but it's not a problem.
-          # The whole cache is dropped monthly to prevent unlimited growth.
-          # The cache is per branch but in case we don't find a branch for a given branch, we will get a cache from another branch.
-          key: ${{ steps.cache-key.outputs.buildtool-cache-key }}
-          restore-keys: |
-            ${{ steps.cache-key.outputs.buildtool-monthly-branch-cache-key }}-
-            ${{ steps.cache-key.outputs.buildtool-monthly-cache-key }}-
-      - name: Restore Maven/Gradle Dependency/Dist Caches
-        uses: actions/cache/restore@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
-        # if it a pull request, we restore the cache but we don't save it
-        if: github.event_name == 'pull_request'
-        with:
-          path: |
-            ~/.m2/repository/
-            ~/.m2/wrapper/
-            ~/.gradle/caches/modules-2
-            ~/.gradle/wrapper/
-          key: ${{ steps.cache-key.outputs.buildtool-cache-key }}
-          restore-keys: |
-            ${{ steps.cache-key.outputs.buildtool-monthly-branch-cache-key }}-
-            ${{ steps.cache-key.outputs.buildtool-monthly-cache-key }}-    
-
-      - name: Run build script
-        run: ./gradlew formatChecks
-        env:
-          # For jobs running on 'push', publish build scan and cache immediately.
-          # This won't work for pull requests, since they don't have access to secrets.
-          POPULATE_REMOTE_GRADLE_CACHE: ${{ github.event_name == 'push' && github.repository == 'hibernate/hibernate-orm' && 'true' || 'false' }}
-          DEVELOCITY_ACCESS_KEY: "${{ secrets.DEVELOCITY_ACCESS_KEY }}"
-
-      # For jobs running on 'pull_request', upload build scan data.
-      # The actual publishing must be done in a separate job (see ci-report.yml).
-      # We don't write to the remote cache as that would be unsafe.
-      - name: Upload GitHub Actions artifact for the Develocity build scan
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
-        if: "${{ github.event_name == 'pull_request' && !cancelled() }}"
-        with:
-          name: build-scan-data-sca
-          path: ~/.gradle/build-scan-data
-
-      - name: Upload test reports (if Gradle failed)
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
-        if: failure()
-        with:
-          name: test-reports-java11-sca
-          path: |
-            ./**/target/reports/tests/
-      - name: Omit produced artifacts from build cache
-        run: ./ci/before-cache.sh