diff --git a/.codecov.yaml b/.codecov.yaml
new file mode 100644
index 000000000000..5c6b28c71e9e
--- /dev/null
+++ b/.codecov.yaml
@@ -0,0 +1,9 @@
+coverage:
+  status:
+    project:
+      default:
+        # Do not pass if PR reduces coverage by more than 5%
+        target: auto
+        threshold: 5
+comment:
+  layout: "header, diff, components, files, footer"
diff --git a/.codecov.yml b/.codecov.yml
deleted file mode 100644
index ef2e1eabfb4b..000000000000
--- a/.codecov.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-comment: off
-
-coverage:
-  status:
-    project:
-      default:
-        target: 0  # Target % coverage, can be auto. Turned off for now
-        threshold: null
-        base: auto
-    patch:
-      default:
-        target: 0
-        threshold: null
-        base: auto
diff --git a/.github/workflows/famedly-tests.yml b/.github/workflows/famedly-tests.yml
new file mode 100644
index 000000000000..3b21f24dfe68
--- /dev/null
+++ b/.github/workflows/famedly-tests.yml
@@ -0,0 +1,373 @@
+name: Tests
+
+on:
+  push:
+  pull_request:
+  merge_group:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check-sampleconfig:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: Swatinem/rust-cache@68b3cb7503c78e67dae8373749990a220eb65352
+      - uses: matrix-org/setup-python-poetry@v1
+        with:
+          python-version: "3.x"
+          poetry-version: "1.3.2"
+          extras: "all"
+      - run: poetry run scripts-dev/generate_sample_config.sh --check
+      - run: poetry run scripts-dev/config-lint.sh
+
+  # We don't update develop currently
+  #check-schema-delta:
+  #  runs-on: ubuntu-latest
+
+  #  steps:
+  #    - uses: actions/checkout@v4
+  #    - uses: actions/setup-python@v5
+  #      with:
+  #        python-version: "3.x"
+  #    - run: "pip install 'click==8.1.1' 'GitPython>=3.1.20'"
+  #    - run: scripts-dev/check_schema_delta.py --force-colors
+
+  check-lockfile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+      - run: .ci/scripts/check_lockfile.py
+
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Poetry
+        uses: matrix-org/setup-python-poetry@v1
+        with:
+          install-project: "false"
+
+      - name: Run ruff check
+        run: poetry run ruff check --output-format=github .
+
+      - name: Run ruff format
+        run: poetry run ruff format --check .
+
+  lint-mypy:
+    runs-on: ubuntu-latest
+    name: Typechecking
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - uses: Swatinem/rust-cache@68b3cb7503c78e67dae8373749990a220eb65352
+
+      - name: Setup Poetry
+        uses: matrix-org/setup-python-poetry@v1
+        with:
+          # We want to make use of type hints in optional dependencies too.
+          extras: all
+          # We have seen odd mypy failures that were resolved when we started
+          # installing the project again:
+          # https://github.com/matrix-org/synapse/pull/15376#issuecomment-1498983775
+          # To make CI green, err towards caution and install the project.
+          install-project: "true"
+
+      # Cribbed from
+      # https://github.com/AustinScola/mypy-cache-github-action/blob/85ea4f2972abed39b33bd02c36e341b28ca59213/src/restore.ts#L10-L17
+      - name: Restore/persist mypy's cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            .mypy_cache
+          key: mypy-cache-${{ github.context.sha }}
+          restore-keys: mypy-cache-
+
+      - name: Run mypy
+        run: poetry run mypy
+
+  lint-crlf:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check line endings
+        run: scripts-dev/check_line_terminators.sh
+
+  lint-pydantic:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+      - uses: Swatinem/rust-cache@68b3cb7503c78e67dae8373749990a220eb65352
+      - uses: matrix-org/setup-python-poetry@v1
+        with:
+          poetry-version: "1.3.2"
+          extras: "all"
+      - run: poetry run scripts-dev/check_pydantic_models.py
+
+  #lint-clippy:
+  #  runs-on: ubuntu-latest
+
+  #  steps:
+  #    - uses: actions/checkout@v4
+
+  #    - uses: Swatinem/rust-cache@68b3cb7503c78e67dae8373749990a220eb65352
+
+  #    - run: cargo clippy -- -D warnings
+
+  #lint-rustfmt:
+  #  runs-on: ubuntu-latest
+
+  #  steps:
+  #    - uses: actions/checkout@v4
+
+  #    - name: Install Rust
+  #      uses: dtolnay/rust-toolchain@master
+  #      with:
+  #        # We use nightly so that it correctly groups together imports
+  #        toolchain: nightly-2022-12-01
+  #        components: rustfmt
+  #    - uses: Swatinem/rust-cache@v2
+
+  #    - run: cargo fmt --check
+
+  # This is to detect issues with the rst file, which can otherwise cause issues
+  # when uploading packages to PyPi.
+  lint-readme:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+      - run: "pip install rstcheck"
+      - run: "rstcheck --report-level=WARNING README.rst"
+
+  # Dummy step to gate other tests on without repeating the whole list
+  linting-done:
+    if: ${{ !cancelled() }} # Run this even if prior jobs were skipped
+    needs:
+      - lint
+      - lint-mypy
+      - lint-crlf
+      - lint-pydantic
+      - check-sampleconfig
+      #- check-schema-delta
+      - check-lockfile
+      #- lint-clippy
+      #- lint-clippy-nightly
+      #- lint-rustfmt
+      - lint-readme
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "done"
+
+  calculate-test-jobs:
+    if: ${{ !cancelled() && !failure() }} # Allow previous steps to be skipped, but not fail
+    needs: linting-done
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+      - id: get-matrix
+        run: .ci/scripts/calculate_jobs.py
+    outputs:
+      trial_test_matrix: ${{ steps.get-matrix.outputs.trial_test_matrix }}
+      sytest_test_matrix: ${{ steps.get-matrix.outputs.sytest_test_matrix }}
+
+  trial:
+    if: ${{ !cancelled() && !failure() }} # Allow previous steps to be skipped, but not fail
+    needs:
+      - calculate-test-jobs
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        job: ${{ fromJson(needs.calculate-test-jobs.outputs.trial_test_matrix) }}
+    env:
+      TOP: ${{ github.workspace }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - run: sudo apt-get -qq install xmlsec1
+      - name: Set up PostgreSQL ${{ matrix.job.postgres-version }}
+        if: ${{ matrix.job.postgres-version }}
+        # 1. Mount postgres data files onto a tmpfs in-memory filesystem to reduce overhead of docker's overlayfs layer.
+        # 2. Expose the unix socket for postgres. This removes latency of using docker-proxy for connections.
+        run: |
+          docker run -d -p 5432:5432 \
+            --tmpfs /var/lib/postgres:rw,size=6144m \
+            --mount 'type=bind,src=/var/run/postgresql,dst=/var/run/postgresql' \
+            -e POSTGRES_PASSWORD=postgres \
+            -e POSTGRES_INITDB_ARGS="--lc-collate C --lc-ctype C --encoding UTF8" \
+            postgres:${{ matrix.job.postgres-version }}
+
+      - uses: Swatinem/rust-cache@68b3cb7503c78e67dae8373749990a220eb65352
+
+      - uses: matrix-org/setup-python-poetry@v1
+        with:
+          python-version: ${{ matrix.job.python-version }}
+          poetry-version: "1.3.2"
+          extras: ${{ matrix.job.extras }}
+      - name: Await PostgreSQL
+        if: ${{ matrix.job.postgres-version }}
+        timeout-minutes: 2
+        run: until pg_isready -h localhost; do sleep 1; done
+      - run: python -m pip install --user coverage
+      - run: poetry run coverage run -m twisted.trial tests
+        # can't run parallel jobs as that breaks coverage
+        env:
+          SYNAPSE_POSTGRES: ${{ matrix.job.database == 'postgres' || '' }}
+          SYNAPSE_POSTGRES_HOST: /var/run/postgresql
+          SYNAPSE_POSTGRES_USER: postgres
+          SYNAPSE_POSTGRES_PASSWORD: postgres
+      - name: Dump logs
+        # Logs are most useful when the command fails, always include them.
+        if: ${{ always() }}
+        # Note: Dumps to workflow logs instead of using actions/upload-artifact
+        #       This keeps logs colocated with failing jobs
+        #       It also ignores find's exit code; this is a best effort affair
+        run: >-
+          find _trial_temp -name '*.log'
+          -exec echo "::group::{}" \;
+          -exec cat {} \;
+          -exec echo "::endgroup::" \;
+          || true
+      - run: poetry run coverage combine
+      - name: Codecov - Upload coverage
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{secrets.CODECOV_TOKEN}}
+
+  sytest:
+    if: ${{ !failure() && !cancelled() }}
+    needs:
+      - calculate-test-jobs
+    runs-on: ubuntu-latest
+    container:
+      image: matrixdotorg/sytest-synapse:${{ matrix.job.sytest-tag }}
+      volumes:
+        - ${{ github.workspace }}:/src
+      env:
+        # If this is a pull request to a release branch, use that branch as default branch for sytest, else use develop
+        # This works because the release script always create a branch on the sytest repo with the same name as the release branch
+        SYTEST_DEFAULT_BRANCH: ${{ startsWith(github.base_ref, 'release-') && github.base_ref || 'develop' }}
+        SYTEST_BRANCH: ${{ github.head_ref }}
+        POSTGRES: ${{ matrix.job.postgres && 1}}
+        MULTI_POSTGRES: ${{ (matrix.job.postgres == 'multi-postgres') || '' }}
+        ASYNCIO_REACTOR: ${{ (matrix.job.reactor == 'asyncio') || '' }}
+        WORKERS: ${{ matrix.job.workers && 1 }}
+        BLACKLIST: ${{ matrix.job.workers && 'synapse-blacklist-with-workers' }}
+        TOP: ${{ github.workspace }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        job: ${{ fromJson(needs.calculate-test-jobs.outputs.sytest_test_matrix) }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Prepare test blacklist
+        run: cat sytest-blacklist .ci/worker-blacklist > synapse-blacklist-with-workers
+
+      - uses: Swatinem/rust-cache@68b3cb7503c78e67dae8373749990a220eb65352
+
+      - name: Run SyTest
+        run: /bootstrap.sh synapse
+        working-directory: /src
+      - name: Summarise results.tap
+        if: ${{ always() }}
+        run: /sytest/scripts/tap_to_gha.pl /logs/results.tap
+      - name: Upload SyTest logs
+        uses: actions/upload-artifact@v4
+        if: ${{ always() }}
+        with:
+          name: Sytest Logs - ${{ job.status }} - (${{ join(matrix.job.*, ', ') }})
+          path: |
+            /logs/results.tap
+            /logs/**/*.log*
+
+  complement:
+    if: "${{ !failure() && !cancelled() }}"
+    needs:
+      - linting-done
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - arrangement: monolith
+            database: SQLite
+
+          - arrangement: monolith
+            database: Postgres
+
+          - arrangement: workers
+            database: Postgres
+
+    steps:
+      - name: Run actions/checkout@v4 for synapse
+        uses: actions/checkout@v4
+        with:
+          path: synapse
+
+      - uses: Swatinem/rust-cache@68b3cb7503c78e67dae8373749990a220eb65352
+
+      - name: Prepare Complement's Prerequisites
+        run: synapse/.ci/scripts/setup_complement_prerequisites.sh
+
+      - uses: actions/setup-go@v5
+        with:
+          cache-dependency-path: complement/go.sum
+          go-version-file: complement/go.mod
+
+        # use p=1 concurrency as GHA boxes are underpowered and don't like running tons of synapses at once.
+      - run: |
+          set -o pipefail
+          COMPLEMENT_DIR=`pwd`/complement synapse/scripts-dev/complement.sh -p 1 -json 2>&1 | synapse/.ci/scripts/gotestfmt
+        shell: bash
+        env:
+          POSTGRES: ${{ (matrix.database == 'Postgres') && 1 || '' }}
+          WORKERS: ${{ (matrix.arrangement == 'workers') && 1 || '' }}
+        name: Run Complement Tests
+
+  cargo-test:
+    runs-on: ubuntu-latest
+    needs:
+      - linting-done
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: Swatinem/rust-cache@68b3cb7503c78e67dae8373749990a220eb65352
+
+      - run: cargo test
+
+  # a job which marks all the other jobs as complete, thus allowing PRs to be merged.
+  tests-done:
+    if: ${{ always() }}
+    needs:
+      - trial
+      - sytest
+      - complement
+      - cargo-test
+      - linting-done
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "done"
diff --git a/poetry.lock b/poetry.lock
index c9c567d6e3ac..de9a527fded5 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.5 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.4 and should not be changed by hand.
 
 [[package]]
 name = "annotated-types"
@@ -354,6 +354,81 @@ files = [
     {file = "constantly-15.1.0.tar.gz", hash = "sha256:586372eb92059873e29eba4f9dec8381541b4d3834660707faf8ba59146dfc35"},
 ]
 
+[[package]]
+name = "coverage"
+version = "7.6.12"
+description = "Code coverage measurement for Python"
+optional = false
+python-versions = ">=3.9"
+files = [
+    {file = "coverage-7.6.12-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:704c8c8c6ce6569286ae9622e534b4f5b9759b6f2cd643f1c1a61f666d534fe8"},
+    {file = "coverage-7.6.12-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:ad7525bf0241e5502168ae9c643a2f6c219fa0a283001cee4cf23a9b7da75879"},
+    {file = "coverage-7.6.12-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:06097c7abfa611c91edb9e6920264e5be1d6ceb374efb4986f38b09eed4cb2fe"},
+    {file = "coverage-7.6.12-cp310-cp310-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:220fa6c0ad7d9caef57f2c8771918324563ef0d8272c94974717c3909664e674"},
+    {file = "coverage-7.6.12-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:3688b99604a24492bcfe1c106278c45586eb819bf66a654d8a9a1433022fb2eb"},
+    {file = "coverage-7.6.12-cp310-cp310-musllinux_1_2_aarch64.whl", hash = "sha256:d1a987778b9c71da2fc8948e6f2656da6ef68f59298b7e9786849634c35d2c3c"},
+    {file = "coverage-7.6.12-cp310-cp310-musllinux_1_2_i686.whl", hash = "sha256:cec6b9ce3bd2b7853d4a4563801292bfee40b030c05a3d29555fd2a8ee9bd68c"},
+    {file = "coverage-7.6.12-cp310-cp310-musllinux_1_2_x86_64.whl", hash = "sha256:ace9048de91293e467b44bce0f0381345078389814ff6e18dbac8fdbf896360e"},
+    {file = "coverage-7.6.12-cp310-cp310-win32.whl", hash = "sha256:ea31689f05043d520113e0552f039603c4dd71fa4c287b64cb3606140c66f425"},
+    {file = "coverage-7.6.12-cp310-cp310-win_amd64.whl", hash = "sha256:676f92141e3c5492d2a1596d52287d0d963df21bf5e55c8b03075a60e1ddf8aa"},
+    {file = "coverage-7.6.12-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:e18aafdfb3e9ec0d261c942d35bd7c28d031c5855dadb491d2723ba54f4c3015"},
+    {file = "coverage-7.6.12-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:66fe626fd7aa5982cdebad23e49e78ef7dbb3e3c2a5960a2b53632f1f703ea45"},
+    {file = "coverage-7.6.12-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:0ef01d70198431719af0b1f5dcbefc557d44a190e749004042927b2a3fed0702"},
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+    {file = "coverage-7.6.12-cp311-cp311-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:e695df2c58ce526eeab11a2e915448d3eb76f75dffe338ea613c1201b33bab2f"},
+    {file = "coverage-7.6.12-cp311-cp311-musllinux_1_2_aarch64.whl", hash = "sha256:d74c08e9aaef995f8c4ef6d202dbd219c318450fe2a76da624f2ebb9c8ec5d9f"},
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+]
+
+[package.extras]
+toml = ["tomli"]
+
 [[package]]
 name = "cryptography"
 version = "43.0.3"
@@ -3142,4 +3217,4 @@ user-search = ["pyicu"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9.0"
-content-hash = "d71159b19349fdc0b7cd8e06e8c8778b603fc37b941c6df34ddc31746783d94d"
+content-hash = "13ac5152d5acbc594206890356964a79417b324dff84704fa33593c16a10764a"
diff --git a/pyproject.toml b/pyproject.toml
index 2d982eae7055..0d8a13f2d272 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -363,6 +363,9 @@ towncrier = ">=18.6.0rc1"
 tomli = ">=1.2.3"
 
 
+[tool.poetry.group.dev.dependencies]
+coverage = "^7.6.12"
+
 [build-system]
 # The upper bounds here are defensive, intended to prevent situations like
 # https://github.com/matrix-org/synapse/issues/13849 and