diff --git a/lib/parrhesia/application.ex b/lib/parrhesia/application.ex
index e232308..13b0b62 100644
--- a/lib/parrhesia/application.ex
+++ b/lib/parrhesia/application.ex
@@ -5,19 +5,6 @@ defmodule Parrhesia.Application do
 
   @impl true
   def start(_type, _args) do
-    children = [
-      Parrhesia.Telemetry,
-      Parrhesia.Config,
-      Parrhesia.Storage.Supervisor,
-      Parrhesia.Subscriptions.Supervisor,
-      Parrhesia.Auth.Supervisor,
-      Parrhesia.Sync.Supervisor,
-      Parrhesia.Policy.Supervisor,
-      Parrhesia.Web.Endpoint,
-      Parrhesia.Tasks.Supervisor
-    ]
-
-    opts = [strategy: :one_for_one, name: Parrhesia.Supervisor]
-    Supervisor.start_link(children, opts)
+    Parrhesia.Runtime.start_link(name: Parrhesia.Supervisor)
   end
 end
diff --git a/lib/parrhesia/runtime.ex b/lib/parrhesia/runtime.ex
new file mode 100644
index 0000000..77bd2f4
--- /dev/null
+++ b/lib/parrhesia/runtime.ex
@@ -0,0 +1,29 @@
+defmodule Parrhesia.Runtime do
+  @moduledoc false
+
+  use Supervisor
+
+  def start_link(opts \\ []) do
+    name = Keyword.get(opts, :name, Parrhesia.Supervisor)
+    Supervisor.start_link(__MODULE__, opts, name: name)
+  end
+
+  @impl true
+  def init(_opts) do
+    Supervisor.init(children(), strategy: :one_for_one)
+  end
+
+  def children do
+    [
+      Parrhesia.Telemetry,
+      Parrhesia.Config,
+      Parrhesia.Storage.Supervisor,
+      Parrhesia.Subscriptions.Supervisor,
+      Parrhesia.Auth.Supervisor,
+      Parrhesia.Sync.Supervisor,
+      Parrhesia.Policy.Supervisor,
+      Parrhesia.Web.Endpoint,
+      Parrhesia.Tasks.Supervisor
+    ]
+  end
+end
diff --git a/mix.exs b/mix.exs
index 75a3c0d..cf5137f 100644
--- a/mix.exs
+++ b/mix.exs
@@ -6,6 +6,7 @@ defmodule Parrhesia.MixProject do
       app: :parrhesia,
       version: "0.5.0",
       elixir: "~> 1.18",
+      elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       aliases: aliases()
@@ -20,6 +21,9 @@ defmodule Parrhesia.MixProject do
     ]
   end
 
+  defp elixirc_paths(:test), do: ["lib", "test/support"]
+  defp elixirc_paths(_env), do: ["lib"]
+
   def cli do
     [preferred_envs: [precommit: :test, bench: :test]]
   end
diff --git a/test/parrhesia/api/acl_test.exs b/test/parrhesia/api/acl_test.exs
index edbaf66..46f521d 100644
--- a/test/parrhesia/api/acl_test.exs
+++ b/test/parrhesia/api/acl_test.exs
@@ -1,14 +1,10 @@
 defmodule Parrhesia.API.ACLTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.API.ACL
   alias Parrhesia.API.RequestContext
-  alias Parrhesia.Repo
 
   setup do
-    :ok = Sandbox.checkout(Repo)
-
     previous_acl = Application.get_env(:parrhesia, :acl, [])
 
     Application.put_env(
diff --git a/test/parrhesia/api/events_test.exs b/test/parrhesia/api/events_test.exs
index 09f8bd3..6d8f166 100644
--- a/test/parrhesia/api/events_test.exs
+++ b/test/parrhesia/api/events_test.exs
@@ -1,16 +1,9 @@
 defmodule Parrhesia.API.EventsTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.API.Events
   alias Parrhesia.API.RequestContext
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
-
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
 
   test "publish stores valid events through the shared API" do
     event = valid_event()
diff --git a/test/parrhesia/api/identity_test.exs b/test/parrhesia/api/identity_test.exs
index 966693a..1c1e33f 100644
--- a/test/parrhesia/api/identity_test.exs
+++ b/test/parrhesia/api/identity_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.API.IdentityTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.API.Auth
   alias Parrhesia.API.Identity
diff --git a/test/parrhesia/api/stream_test.exs b/test/parrhesia/api/stream_test.exs
index 941686b..ba4165a 100644
--- a/test/parrhesia/api/stream_test.exs
+++ b/test/parrhesia/api/stream_test.exs
@@ -1,19 +1,10 @@
 defmodule Parrhesia.API.StreamTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.API.Events
   alias Parrhesia.API.RequestContext
   alias Parrhesia.API.Stream
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
-
-  setup do
-    ensure_repo_started()
-    ensure_stream_runtime_started()
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
 
   test "subscribe streams catch-up events followed by eose" do
     event = valid_event()
@@ -79,24 +70,4 @@ defmodule Parrhesia.API.StreamTest do
   defp recalculate_event_id(event) do
     Map.put(event, "id", EventValidator.compute_id(event))
   end
-
-  defp ensure_stream_runtime_started do
-    if is_nil(Process.whereis(Parrhesia.API.Stream.Supervisor)) do
-      case start_supervised({Parrhesia.Subscriptions.Supervisor, []}) do
-        {:ok, _pid} -> :ok
-        {:error, {:already_started, _pid}} -> :ok
-      end
-    else
-      :ok
-    end
-  end
-
-  defp ensure_repo_started do
-    if is_nil(Process.whereis(Repo)) do
-      _ = start_supervised(Repo)
-      :ok
-    else
-      :ok
-    end
-  end
 end
diff --git a/test/parrhesia/api/sync_test.exs b/test/parrhesia/api/sync_test.exs
index 3b4eacf..5d498a4 100644
--- a/test/parrhesia/api/sync_test.exs
+++ b/test/parrhesia/api/sync_test.exs
@@ -1,16 +1,9 @@
 defmodule Parrhesia.API.SyncTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.API.Admin
   alias Parrhesia.API.Sync
   alias Parrhesia.API.Sync.Manager
-  alias Parrhesia.Repo
-
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
 
   test "put_server stores normalized config and persists it across restart" do
     {manager, path, pid} = start_sync_manager()
diff --git a/test/parrhesia/application_test.exs b/test/parrhesia/application_test.exs
index 9834cf5..3c9043a 100644
--- a/test/parrhesia/application_test.exs
+++ b/test/parrhesia/application_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.ApplicationTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   test "starts the core supervision tree" do
     assert is_pid(Process.whereis(Parrhesia.Supervisor))
diff --git a/test/parrhesia/e2e/nak_cli_test.exs b/test/parrhesia/e2e/nak_cli_test.exs
index 96986fb..704e276 100644
--- a/test/parrhesia/e2e/nak_cli_test.exs
+++ b/test/parrhesia/e2e/nak_cli_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.E2E.NakCliTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   @moduletag :nak_e2e
 
diff --git a/test/parrhesia/fanout/multi_node_test.exs b/test/parrhesia/fanout/multi_node_test.exs
index 9581e82..8518b57 100644
--- a/test/parrhesia/fanout/multi_node_test.exs
+++ b/test/parrhesia/fanout/multi_node_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.Fanout.MultiNodeTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Fanout.MultiNode
   alias Parrhesia.Subscriptions.Index
diff --git a/test/parrhesia/fault_injection_group_flow_test.exs b/test/parrhesia/fault_injection_group_flow_test.exs
index 78d2b5a..c4a070e 100644
--- a/test/parrhesia/fault_injection_group_flow_test.exs
+++ b/test/parrhesia/fault_injection_group_flow_test.exs
@@ -1,17 +1,13 @@
 defmodule Parrhesia.FaultInjectionGroupFlowTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
   alias Parrhesia.Storage
   alias Parrhesia.TestSupport.FailingEvents
   alias Parrhesia.TestSupport.PermissiveModeration
   alias Parrhesia.Web.Connection
 
   setup do
-    :ok = Sandbox.checkout(Repo)
-
     previous_storage = Application.get_env(:parrhesia, :storage, [])
 
     Application.put_env(
diff --git a/test/parrhesia/fault_injection_test.exs b/test/parrhesia/fault_injection_test.exs
index d338186..5d976ac 100644
--- a/test/parrhesia/fault_injection_test.exs
+++ b/test/parrhesia/fault_injection_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.FaultInjectionTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Protocol.EventValidator
   alias Parrhesia.Web.Connection
diff --git a/test/parrhesia/groups/flow_test.exs b/test/parrhesia/groups/flow_test.exs
index ce1463e..151e160 100644
--- a/test/parrhesia/groups/flow_test.exs
+++ b/test/parrhesia/groups/flow_test.exs
@@ -1,16 +1,9 @@
 defmodule Parrhesia.Groups.FlowTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.Groups.Flow
-  alias Parrhesia.Repo
   alias Parrhesia.Storage
 
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
-
   test "handles membership request kinds by upserting group memberships" do
     event = %{
       "kind" => 8_000,
diff --git a/test/parrhesia/negentropy/sessions_test.exs b/test/parrhesia/negentropy/sessions_test.exs
index f1b8542..53449b4 100644
--- a/test/parrhesia/negentropy/sessions_test.exs
+++ b/test/parrhesia/negentropy/sessions_test.exs
@@ -1,7 +1,6 @@
 defmodule Parrhesia.Negentropy.SessionsTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.Negentropy.Engine
   alias Parrhesia.Negentropy.Message
   alias Parrhesia.Negentropy.Sessions
@@ -9,20 +8,6 @@ defmodule Parrhesia.Negentropy.SessionsTest do
   alias Parrhesia.Repo
   alias Parrhesia.Storage.Adapters.Postgres.Events
 
-  setup_all do
-    if is_nil(Process.whereis(Repo)) do
-      start_supervised!(Repo)
-    end
-
-    Sandbox.mode(Repo, :manual)
-    :ok
-  end
-
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
-
   test "opens, responds, advances and closes sessions" do
     server = start_supervised!({Sessions, name: nil})
     Sandbox.allow(Repo, self(), server)
diff --git a/test/parrhesia/performance/load_soak_test.exs b/test/parrhesia/performance/load_soak_test.exs
index a6a267b..a93004a 100644
--- a/test/parrhesia/performance/load_soak_test.exs
+++ b/test/parrhesia/performance/load_soak_test.exs
@@ -1,14 +1,10 @@
 defmodule Parrhesia.Performance.LoadSoakTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
-  alias Parrhesia.Repo
   alias Parrhesia.Web.Connection
 
   @tag :performance
   test "fanout enqueue/drain stays within relaxed p95 budget" do
-    :ok = Sandbox.checkout(Repo)
-
     {:ok, state} = Connection.init(subscription_index: nil, max_outbound_queue: 10_000)
 
     req_payload = JSON.encode!(["REQ", "sub-load", %{"kinds" => [1]}])
diff --git a/test/parrhesia/policy/event_policy_test.exs b/test/parrhesia/policy/event_policy_test.exs
index 772e826..18d479e 100644
--- a/test/parrhesia/policy/event_policy_test.exs
+++ b/test/parrhesia/policy/event_policy_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.Policy.EventPolicyTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Policy.EventPolicy
 
diff --git a/test/parrhesia/protocol/event_validator_signature_test.exs b/test/parrhesia/protocol/event_validator_signature_test.exs
index 8655151..c10918a 100644
--- a/test/parrhesia/protocol/event_validator_signature_test.exs
+++ b/test/parrhesia/protocol/event_validator_signature_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.Protocol.EventValidatorSignatureTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Protocol.EventValidator
 
diff --git a/test/parrhesia/storage/adapters/memory/adapter_test.exs b/test/parrhesia/storage/adapters/memory/adapter_test.exs
index b504415..4b99760 100644
--- a/test/parrhesia/storage/adapters/memory/adapter_test.exs
+++ b/test/parrhesia/storage/adapters/memory/adapter_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.Storage.Adapters.Memory.AdapterTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Storage.Adapters.Memory.ACL
   alias Parrhesia.Storage.Adapters.Memory.Admin
diff --git a/test/parrhesia/storage/adapters/postgres/adapter_contract_test.exs b/test/parrhesia/storage/adapters/postgres/adapter_contract_test.exs
index f0e17e6..81d65de 100644
--- a/test/parrhesia/storage/adapters/postgres/adapter_contract_test.exs
+++ b/test/parrhesia/storage/adapters/postgres/adapter_contract_test.exs
@@ -1,26 +1,11 @@
 defmodule Parrhesia.Storage.Adapters.Postgres.AdapterContractTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
-  alias Parrhesia.Repo
   alias Parrhesia.Storage.Adapters.Postgres.ACL
   alias Parrhesia.Storage.Adapters.Postgres.Admin
   alias Parrhesia.Storage.Adapters.Postgres.Groups
   alias Parrhesia.Storage.Adapters.Postgres.Moderation
 
-  setup_all do
-    if is_nil(Process.whereis(Repo)) do
-      start_supervised!(Repo)
-    end
-
-    Sandbox.mode(Repo, :manual)
-    :ok
-  end
-
-  setup do
-    :ok = Sandbox.checkout(Repo)
-  end
-
   test "moderation adapter persists pubkey/event/ip block state" do
     pubkey = String.duplicate("a", 64)
     event_id = String.duplicate("b", 64)
diff --git a/test/parrhesia/storage/adapters/postgres/events_lifecycle_test.exs b/test/parrhesia/storage/adapters/postgres/events_lifecycle_test.exs
index ee16b1e..53c384f 100644
--- a/test/parrhesia/storage/adapters/postgres/events_lifecycle_test.exs
+++ b/test/parrhesia/storage/adapters/postgres/events_lifecycle_test.exs
@@ -1,16 +1,9 @@
 defmodule Parrhesia.Storage.Adapters.Postgres.EventsLifecycleTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
   alias Parrhesia.Storage.Adapters.Postgres.Events
 
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
-
   test "event tags round-trip without truncation" do
     tagged_event =
       event(%{
diff --git a/test/parrhesia/storage/adapters/postgres/events_query_count_test.exs b/test/parrhesia/storage/adapters/postgres/events_query_count_test.exs
index 2cb4f6f..1b38a08 100644
--- a/test/parrhesia/storage/adapters/postgres/events_query_count_test.exs
+++ b/test/parrhesia/storage/adapters/postgres/events_query_count_test.exs
@@ -1,24 +1,9 @@
 defmodule Parrhesia.Storage.Adapters.Postgres.EventsQueryCountTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
   alias Parrhesia.Storage.Adapters.Postgres.Events
 
-  setup_all do
-    if is_nil(Process.whereis(Repo)) do
-      start_supervised!(Repo)
-    end
-
-    Sandbox.mode(Repo, :manual)
-    :ok
-  end
-
-  setup do
-    :ok = Sandbox.checkout(Repo)
-  end
-
   test "query/3 translates NIP filters including tag filters" do
     author = String.duplicate("a", 64)
     other_author = String.duplicate("b", 64)
diff --git a/test/parrhesia/storage/adapters/postgres/events_test.exs b/test/parrhesia/storage/adapters/postgres/events_test.exs
index 334c155..327c513 100644
--- a/test/parrhesia/storage/adapters/postgres/events_test.exs
+++ b/test/parrhesia/storage/adapters/postgres/events_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.Storage.Adapters.Postgres.EventsTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Protocol.EventValidator
   alias Parrhesia.Storage.Adapters.Postgres.Events
diff --git a/test/parrhesia/storage/adapters/postgres/query_plan_regression_test.exs b/test/parrhesia/storage/adapters/postgres/query_plan_regression_test.exs
index 0dc57ac..83931ec 100644
--- a/test/parrhesia/storage/adapters/postgres/query_plan_regression_test.exs
+++ b/test/parrhesia/storage/adapters/postgres/query_plan_regression_test.exs
@@ -1,22 +1,11 @@
 defmodule Parrhesia.Storage.Adapters.Postgres.QueryPlanRegressionTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.Protocol.EventValidator
   alias Parrhesia.Repo
   alias Parrhesia.Storage.Adapters.Postgres.Events
 
-  setup_all do
-    if is_nil(Process.whereis(Repo)) do
-      start_supervised!(Repo)
-    end
-
-    Sandbox.mode(Repo, :manual)
-    :ok
-  end
-
   setup do
-    :ok = Sandbox.checkout(Repo)
     :ok = Repo.query!("SET enable_seqscan TO off") |> then(fn _ -> :ok end)
   end
 
diff --git a/test/parrhesia/storage/partitions_test.exs b/test/parrhesia/storage/partitions_test.exs
index 2f19ddf..7ae9c35 100644
--- a/test/parrhesia/storage/partitions_test.exs
+++ b/test/parrhesia/storage/partitions_test.exs
@@ -1,15 +1,8 @@
 defmodule Parrhesia.Storage.PartitionsTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
-  alias Parrhesia.Repo
   alias Parrhesia.Storage.Partitions
 
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
-
   test "list_partitions returns partition tables" do
     partitions = Partitions.list_partitions()
     assert is_list(partitions)
diff --git a/test/parrhesia/storage_test.exs b/test/parrhesia/storage_test.exs
index 467bb07..048fc4a 100644
--- a/test/parrhesia/storage_test.exs
+++ b/test/parrhesia/storage_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.StorageTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Storage
 
diff --git a/test/parrhesia/sync/worker_test.exs b/test/parrhesia/sync/worker_test.exs
index 72f01dd..0a87ee0 100644
--- a/test/parrhesia/sync/worker_test.exs
+++ b/test/parrhesia/sync/worker_test.exs
@@ -1,29 +1,16 @@
 defmodule Parrhesia.Sync.WorkerTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: :shared
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.API.ACL
   alias Parrhesia.API.Events
   alias Parrhesia.API.Identity
   alias Parrhesia.API.RequestContext
   alias Parrhesia.API.Sync
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
   alias Parrhesia.Sync.Supervisor
   alias Parrhesia.TestSupport.SyncFakeRelay.Plug
   alias Parrhesia.TestSupport.SyncFakeRelay.Server
 
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    Sandbox.mode(Repo, {:shared, self()})
-
-    on_exit(fn ->
-      Sandbox.mode(Repo, :manual)
-    end)
-
-    :ok
-  end
-
   test "req_stream worker verifies remote identity, authenticates, syncs catch-up, streams live, and sync_now reruns catch-up" do
     {:ok, %{pubkey: local_pubkey}} = Identity.ensure()
     remote_pubkey = String.duplicate("b", 64)
diff --git a/test/parrhesia/tasks/expiration_worker_test.exs b/test/parrhesia/tasks/expiration_worker_test.exs
index 2263d99..4cce0e0 100644
--- a/test/parrhesia/tasks/expiration_worker_test.exs
+++ b/test/parrhesia/tasks/expiration_worker_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.Tasks.ExpirationWorkerTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Tasks.ExpirationWorker
   alias Parrhesia.TestSupport.ExpirationStubEvents
diff --git a/test/parrhesia/tasks/partition_retention_worker_test.exs b/test/parrhesia/tasks/partition_retention_worker_test.exs
index cea7d35..7a0dcab 100644
--- a/test/parrhesia/tasks/partition_retention_worker_test.exs
+++ b/test/parrhesia/tasks/partition_retention_worker_test.exs
@@ -1,5 +1,5 @@
 defmodule Parrhesia.Tasks.PartitionRetentionWorkerTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false
 
   alias Parrhesia.Tasks.PartitionRetentionWorker
   alias Parrhesia.TestSupport.PartitionRetentionStubPartitions
diff --git a/test/parrhesia/web/conformance_test.exs b/test/parrhesia/web/conformance_test.exs
index 6faadb3..0fb08d1 100644
--- a/test/parrhesia/web/conformance_test.exs
+++ b/test/parrhesia/web/conformance_test.exs
@@ -1,17 +1,10 @@
 defmodule Parrhesia.Web.ConformanceTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
   alias Parrhesia.Storage
   alias Parrhesia.Web.Connection
 
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
-
   test "REQ -> EOSE emitted once and CLOSE emits CLOSED" do
     {:ok, state} = Connection.init(subscription_index: nil)
 
diff --git a/test/parrhesia/web/connection_test.exs b/test/parrhesia/web/connection_test.exs
index a87520e..2882618 100644
--- a/test/parrhesia/web/connection_test.exs
+++ b/test/parrhesia/web/connection_test.exs
@@ -1,23 +1,14 @@
 defmodule Parrhesia.Web.ConnectionTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.API.ACL
   alias Parrhesia.API.Events
   alias Parrhesia.API.RequestContext
   alias Parrhesia.Negentropy.Engine
   alias Parrhesia.Negentropy.Message
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
   alias Parrhesia.Web.Connection
 
-  setup do
-    ensure_repo_started()
-    ensure_stream_runtime_started()
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
-
   test "REQ registers subscription, streams initial events and replies with EOSE" do
     state = connection_state()
 
@@ -876,26 +867,6 @@ defmodule Parrhesia.Web.ConnectionTest do
     state
   end
 
-  defp ensure_stream_runtime_started do
-    if is_nil(Process.whereis(Parrhesia.API.Stream.Supervisor)) do
-      case start_supervised({Parrhesia.Subscriptions.Supervisor, []}) do
-        {:ok, _pid} -> :ok
-        {:error, {:already_started, _pid}} -> :ok
-      end
-    else
-      :ok
-    end
-  end
-
-  defp ensure_repo_started do
-    if is_nil(Process.whereis(Repo)) do
-      _ = start_supervised(Repo)
-      :ok
-    else
-      :ok
-    end
-  end
-
   defp listener(overrides) do
     base = %{
       id: :test,
diff --git a/test/parrhesia/web/proxy_ip_e2e_test.exs b/test/parrhesia/web/proxy_ip_e2e_test.exs
index ef490e7..5dba3dc 100644
--- a/test/parrhesia/web/proxy_ip_e2e_test.exs
+++ b/test/parrhesia/web/proxy_ip_e2e_test.exs
@@ -1,9 +1,7 @@
 defmodule Parrhesia.Web.ProxyIpE2ETest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: :shared
 
   alias __MODULE__.TestClient
-  alias Ecto.Adapters.SQL.Sandbox
-  alias Parrhesia.Repo
 
   setup_all do
     {:ok, _apps} = Application.ensure_all_started(:websockex)
@@ -11,14 +9,10 @@ defmodule Parrhesia.Web.ProxyIpE2ETest do
   end
 
   setup do
-    :ok = Sandbox.checkout(Repo)
-    Sandbox.mode(Repo, {:shared, self()})
-
     previous_trusted_proxies = Application.get_env(:parrhesia, :trusted_proxies, [])
 
     on_exit(fn ->
       Application.put_env(:parrhesia, :trusted_proxies, previous_trusted_proxies)
-      Sandbox.mode(Repo, :manual)
     end)
 
     {:ok, port: free_port()}
diff --git a/test/parrhesia/web/router_test.exs b/test/parrhesia/web/router_test.exs
index 5b8fcaf..7996897 100644
--- a/test/parrhesia/web/router_test.exs
+++ b/test/parrhesia/web/router_test.exs
@@ -1,21 +1,14 @@
 defmodule Parrhesia.Web.RouterTest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: true
 
   import Plug.Conn
   import Plug.Test
 
-  alias Ecto.Adapters.SQL.Sandbox
   alias Parrhesia.API.Sync
   alias Parrhesia.Protocol.EventValidator
-  alias Parrhesia.Repo
   alias Parrhesia.Web.Listener
   alias Parrhesia.Web.Router
 
-  setup do
-    :ok = Sandbox.checkout(Repo)
-    :ok
-  end
-
   test "GET /health returns ok" do
     conn = conn(:get, "/health") |> Router.call([])
 
diff --git a/test/parrhesia/web/tls_e2e_test.exs b/test/parrhesia/web/tls_e2e_test.exs
index 707c1c1..355e4a6 100644
--- a/test/parrhesia/web/tls_e2e_test.exs
+++ b/test/parrhesia/web/tls_e2e_test.exs
@@ -1,16 +1,11 @@
 defmodule Parrhesia.Web.TLSE2ETest do
-  use ExUnit.Case, async: false
+  use Parrhesia.IntegrationCase, async: false, sandbox: :shared
 
-  alias Ecto.Adapters.SQL.Sandbox
-  alias Parrhesia.Repo
   alias Parrhesia.Sync.Transport.WebSockexClient
   alias Parrhesia.TestSupport.TLSCerts
   alias Parrhesia.Web.Endpoint
 
   setup do
-    :ok = Sandbox.checkout(Repo)
-    Sandbox.mode(Repo, {:shared, self()})
-
     tmp_dir =
       Path.join(
         System.tmp_dir!(),
@@ -20,7 +15,6 @@ defmodule Parrhesia.Web.TLSE2ETest do
     File.mkdir_p!(tmp_dir)
 
     on_exit(fn ->
-      Sandbox.mode(Repo, :manual)
       _ = File.rm_rf(tmp_dir)
     end)
 
diff --git a/test/support/integration_case.ex b/test/support/integration_case.ex
new file mode 100644
index 0000000..5d41e96
--- /dev/null
+++ b/test/support/integration_case.ex
@@ -0,0 +1,43 @@
+defmodule Parrhesia.IntegrationCase do
+  @moduledoc false
+
+  use ExUnit.CaseTemplate
+
+  alias Ecto.Adapters.SQL.Sandbox
+  alias ExUnit.Case
+  alias Parrhesia.Repo
+  alias Parrhesia.TestSupport.Runtime
+
+  using opts do
+    quote bind_quoted: [opts: opts] do
+      use Case, async: Keyword.get(opts, :async, false)
+
+      alias Ecto.Adapters.SQL.Sandbox
+      alias Parrhesia.Repo
+
+      @moduletag parrhesia_sandbox: Keyword.get(opts, :sandbox, false)
+    end
+  end
+
+  setup tags do
+    Runtime.ensure_started!()
+
+    case tags[:parrhesia_sandbox] do
+      false ->
+        :ok
+
+      true ->
+        :ok = Sandbox.checkout(Repo)
+
+      :shared ->
+        :ok = Sandbox.checkout(Repo)
+        Sandbox.mode(Repo, {:shared, self()})
+
+        on_exit(fn ->
+          Sandbox.mode(Repo, :manual)
+        end)
+    end
+
+    :ok
+  end
+end
diff --git a/test/support/runtime.ex b/test/support/runtime.ex
new file mode 100644
index 0000000..4d71765
--- /dev/null
+++ b/test/support/runtime.ex
@@ -0,0 +1,34 @@
+defmodule Parrhesia.TestSupport.Runtime do
+  @moduledoc false
+
+  @required_processes [
+    Parrhesia.Supervisor,
+    Parrhesia.Config,
+    Parrhesia.Repo,
+    Parrhesia.Subscriptions.Supervisor,
+    Parrhesia.Web.Endpoint
+  ]
+
+  def ensure_started! do
+    if healthy?() do
+      :ok
+    else
+      restart!()
+    end
+  end
+
+  defp healthy? do
+    Enum.all?(@required_processes, &is_pid(Process.whereis(&1)))
+  end
+
+  defp restart! do
+    case Application.stop(:parrhesia) do
+      :ok -> :ok
+      {:error, {:not_started, :parrhesia}} -> :ok
+      {:error, {:not_started, _app}} -> :ok
+    end
+
+    {:ok, _apps} = Application.ensure_all_started(:parrhesia)
+    :ok
+  end
+end
diff --git a/test/test_helper.exs b/test/test_helper.exs
index bd54632..eaf59ee 100644
--- a/test/test_helper.exs
+++ b/test/test_helper.exs
@@ -5,6 +5,4 @@ exclude_tags =
     [:nak_e2e]
   end
 
-{:ok, _apps} = Application.ensure_all_started(:parrhesia)
-
 ExUnit.start(exclude: exclude_tags)