diff --git a/server/lib/api-tests/test/Test/DataConnector/MetadataApiSpec.hs b/server/lib/api-tests/test/Test/DataConnector/MetadataApiSpec.hs
index 7e391aad45e..ca3f21ea6d4 100644
--- a/server/lib/api-tests/test/Test/DataConnector/MetadataApiSpec.hs
+++ b/server/lib/api-tests/test/Test/DataConnector/MetadataApiSpec.hs
@@ -1,4 +1,6 @@
 {-# LANGUAGE QuasiQuotes #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 -- | Metadata API tests for Data Connector Backend
 module Test.DataConnector.MetadataApiSpec
@@ -33,7 +35,7 @@ import Test.Hspec (SpecWith, describe, it, pendingWith)
 
 spec :: SpecWith TestEnvironment
 spec = do
-  Fixture.runWithLocalTestEnvironment
+  Fixture.runWithLocalTestEnvironmentSingleSetup
     ( NE.fromList
         [ (Fixture.fixture $ Fixture.Backend Fixture.DataConnectorReference)
             { Fixture.setupTeardown = \(testEnv, _) ->
@@ -47,7 +49,7 @@ spec = do
     )
     schemaCrudTests
 
-  Fixture.runWithLocalTestEnvironment
+  Fixture.runWithLocalTestEnvironmentSingleSetup
     ( NE.fromList
         [ (Fixture.fixture $ Fixture.Backend Fixture.DataConnectorReference)
             { Fixture.setupTeardown = \(testEnv, _) ->
diff --git a/server/lib/api-tests/test/Test/EventTrigger/PG/EventTriggersRecreationSpec.hs b/server/lib/api-tests/test/Test/EventTrigger/PG/EventTriggersRecreationSpec.hs
index f8f16ba4dd2..285e34b632b 100644
--- a/server/lib/api-tests/test/Test/EventTrigger/PG/EventTriggersRecreationSpec.hs
+++ b/server/lib/api-tests/test/Test/EventTrigger/PG/EventTriggersRecreationSpec.hs
@@ -1,4 +1,6 @@
 {-# LANGUAGE QuasiQuotes #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 module Test.EventTrigger.PG.EventTriggersRecreationSpec (spec) where
 
@@ -22,7 +24,7 @@ import Test.Hspec (SpecWith, it)
 
 spec :: SpecWith TestEnvironment
 spec =
-  Fixture.runWithLocalTestEnvironment
+  Fixture.runWithLocalTestEnvironmentSingleSetup
     ( NE.fromList
         [ (Fixture.fixture $ Fixture.Backend Fixture.Postgres)
             { Fixture.mkLocalTestEnvironment = webhookServerMkLocalTestEnvironment,
diff --git a/server/lib/api-tests/test/Test/EventTrigger/PG/EventTriggersRunSQLSpec.hs b/server/lib/api-tests/test/Test/EventTrigger/PG/EventTriggersRunSQLSpec.hs
index a372a8e3c4b..58ddd080f7b 100644
--- a/server/lib/api-tests/test/Test/EventTrigger/PG/EventTriggersRunSQLSpec.hs
+++ b/server/lib/api-tests/test/Test/EventTrigger/PG/EventTriggersRunSQLSpec.hs
@@ -1,5 +1,7 @@
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE ViewPatterns #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 -- | Testing the `run_sql` API
 module Test.EventTrigger.PG.EventTriggersRunSQLSpec (spec) where
@@ -29,7 +31,7 @@ import Test.Hspec (SpecWith, it, shouldBe)
 
 spec :: SpecWith TestEnvironment
 spec =
-  Fixture.runWithLocalTestEnvironment
+  Fixture.runWithLocalTestEnvironmentSingleSetup
     ( NE.fromList
         [ (Fixture.fixture $ Fixture.Backend Fixture.Postgres)
             { -- setup the webhook server as the local test environment,
diff --git a/server/lib/api-tests/test/Test/Postgres/DefaultValuesSpec.hs b/server/lib/api-tests/test/Test/Postgres/DefaultValuesSpec.hs
index 6c9390de0a1..cffef18d3ee 100644
--- a/server/lib/api-tests/test/Test/Postgres/DefaultValuesSpec.hs
+++ b/server/lib/api-tests/test/Test/Postgres/DefaultValuesSpec.hs
@@ -1,4 +1,6 @@
 {-# LANGUAGE QuasiQuotes #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 -- |
 -- Tests for the behaviour of columns with default values.
@@ -23,7 +25,7 @@ import Test.Hspec (SpecWith, describe, it)
 
 spec :: SpecWith TestEnvironment
 spec =
-  Fixture.run
+  Fixture.runSingleSetup
     ( NE.fromList
         [ (Fixture.fixture $ Fixture.Backend Fixture.Postgres)
             { Fixture.setupTeardown = \(testEnv, _) ->
diff --git a/server/lib/api-tests/test/Test/RemoteRelationship/FromRemoteSchemaSpec.hs b/server/lib/api-tests/test/Test/RemoteRelationship/FromRemoteSchemaSpec.hs
index 91bd7369742..c1bae41d4a6 100644
--- a/server/lib/api-tests/test/Test/RemoteRelationship/FromRemoteSchemaSpec.hs
+++ b/server/lib/api-tests/test/Test/RemoteRelationship/FromRemoteSchemaSpec.hs
@@ -1,5 +1,7 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE QuasiQuotes #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 -- | Tests for remote relationships from remote schemas. Unlike the "ToX"
 -- modules, this module specifically cares about the remote schema on the LHS:
@@ -29,7 +31,7 @@ import Test.Hspec (SpecWith, describe, it)
 -- Preamble
 
 spec :: SpecWith TestEnvironment
-spec = Fixture.runWithLocalTestEnvironment (NE.fromList [context]) tests
+spec = Fixture.runWithLocalTestEnvironmentSingleSetup (NE.fromList [context]) tests
   where
     context =
       (Fixture.fixture $ Fixture.RemoteGraphQLServer)
diff --git a/server/lib/api-tests/test/Test/RemoteRelationship/MetadataAPI/DropSource/DBtoDBRelationshipSpec.hs b/server/lib/api-tests/test/Test/RemoteRelationship/MetadataAPI/DropSource/DBtoDBRelationshipSpec.hs
index fbaa71ec4d0..2c18a04c6b6 100644
--- a/server/lib/api-tests/test/Test/RemoteRelationship/MetadataAPI/DropSource/DBtoDBRelationshipSpec.hs
+++ b/server/lib/api-tests/test/Test/RemoteRelationship/MetadataAPI/DropSource/DBtoDBRelationshipSpec.hs
@@ -1,5 +1,7 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE QuasiQuotes #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 -- | Test that drop_source metadata API executes successfully when any remote
 -- relationships is present between a database and a database.
@@ -46,7 +48,7 @@ import Test.RemoteRelationship.MetadataAPI.Common (LocalTestTestEnvironment (..)
 -- Preamble
 
 spec :: SpecWith TestEnvironment
-spec = Fixture.runWithLocalTestEnvironment contexts tests
+spec = Fixture.runWithLocalTestEnvironmentSingleSetup contexts tests
   where
     contexts = NE.fromList [dbTodbRemoteRelationshipFixture]
 
diff --git a/server/lib/api-tests/test/Test/RemoteRelationship/MetadataAPI/DropSource/RSToDBRelationshipSpec.hs b/server/lib/api-tests/test/Test/RemoteRelationship/MetadataAPI/DropSource/RSToDBRelationshipSpec.hs
index e41a247f7cc..236ccbbdf6a 100644
--- a/server/lib/api-tests/test/Test/RemoteRelationship/MetadataAPI/DropSource/RSToDBRelationshipSpec.hs
+++ b/server/lib/api-tests/test/Test/RemoteRelationship/MetadataAPI/DropSource/RSToDBRelationshipSpec.hs
@@ -1,5 +1,7 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE QuasiQuotes #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 -- | Test that drop_source metadata API executes successfully when any remote
 -- relationships is present between a remote schema and a database.
@@ -46,7 +48,7 @@ import Test.RemoteRelationship.MetadataAPI.Common (LocalTestTestEnvironment (..)
 -- Preamble
 
 spec :: SpecWith TestEnvironment
-spec = Fixture.runWithLocalTestEnvironment contexts tests
+spec = Fixture.runWithLocalTestEnvironmentSingleSetup contexts tests
   where
     contexts = NE.fromList [remoteSchemaToDBRemoteRelationshipFixture]
 
diff --git a/server/lib/api-tests/test/Test/SQLServer/DefaultValuesSpec.hs b/server/lib/api-tests/test/Test/SQLServer/DefaultValuesSpec.hs
index 873d5ba0ce8..b8a9c39e6b4 100644
--- a/server/lib/api-tests/test/Test/SQLServer/DefaultValuesSpec.hs
+++ b/server/lib/api-tests/test/Test/SQLServer/DefaultValuesSpec.hs
@@ -1,4 +1,6 @@
 {-# LANGUAGE QuasiQuotes #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 -- | Test that Postgres databases correctly roundtrip timestamps.
 --
@@ -20,7 +22,7 @@ import Test.Hspec (SpecWith, describe, it)
 
 spec :: SpecWith TestEnvironment
 spec =
-  Fixture.run
+  Fixture.runSingleSetup
     ( NE.fromList
         [ (Fixture.fixture $ Fixture.Backend Fixture.SQLServer)
             { Fixture.setupTeardown = \(testEnv, _) ->
diff --git a/server/lib/api-tests/test/Test/Schema/CustomFieldNames/MutationSpec.hs b/server/lib/api-tests/test/Test/Schema/CustomFieldNames/MutationSpec.hs
index 8c7042f110a..ac2a5d65790 100644
--- a/server/lib/api-tests/test/Test/Schema/CustomFieldNames/MutationSpec.hs
+++ b/server/lib/api-tests/test/Test/Schema/CustomFieldNames/MutationSpec.hs
@@ -1,4 +1,6 @@
 {-# LANGUAGE QuasiQuotes #-}
+-- For runWithLocalTestEnvironmentSingleSetup
+{-# OPTIONS_GHC -Wno-deprecations #-}
 
 -- |
 -- Tests around mutations involving fields with custom names.
@@ -27,7 +29,7 @@ import Prelude
 
 spec :: SpecWith TestEnvironment
 spec = do
-  Fixture.run
+  Fixture.runSingleSetup
     ( NE.fromList
         [ (Fixture.fixture $ Fixture.Backend Fixture.Postgres)
             { Fixture.setupTeardown = \(testEnv, _) ->
diff --git a/server/lib/test-harness/src/Harness/Test/Fixture.hs b/server/lib/test-harness/src/Harness/Test/Fixture.hs
index 46b44abd6a5..f644ce1403c 100644
--- a/server/lib/test-harness/src/Harness/Test/Fixture.hs
+++ b/server/lib/test-harness/src/Harness/Test/Fixture.hs
@@ -4,7 +4,9 @@
 -- Central types and functions are 'Fixture', 'SetupAction', and 'run'.
 module Harness.Test.Fixture
   ( run,
+    runSingleSetup,
     runWithLocalTestEnvironment,
+    runWithLocalTestEnvironmentSingleSetup,
     Fixture (..),
     fixture,
     FixtureName (..),
@@ -28,7 +30,15 @@ import Harness.Test.BackendType
 import Harness.Test.CustomOptions
 import Harness.TestEnvironment (TestEnvironment (..), testLog)
 import Hasura.Prelude
-import Test.Hspec (SpecWith, aroundAllWith, aroundWith, beforeWith, describe, pendingWith)
+import Test.Hspec
+  ( ActionWith,
+    SpecWith,
+    aroundAllWith,
+    aroundWith,
+    beforeWith,
+    describe,
+    pendingWith,
+  )
 
 -- | Runs the given tests, for each provided 'Fixture'@ ()@.
 --
@@ -43,10 +53,17 @@ import Test.Hspec (SpecWith, aroundAllWith, aroundWith, beforeWith, describe, pe
 --
 -- For a more general version that can run tests for any 'Fixture'@ a@, see
 -- 'runWithLocalTestEnvironment'.
+--
+-- This function runs setup and teardown for each Spec item individually.
 run :: NonEmpty (Fixture ()) -> (Options -> SpecWith TestEnvironment) -> SpecWith TestEnvironment
 run fixtures tests = do
   runWithLocalTestEnvironment fixtures (\opts -> beforeWith (\(te, ()) -> return te) (tests opts))
 
+{-# DEPRECATED runSingleSetup "runSingleSetup lets all specs in aFixture share a single database environment, which impedes parallelisation and out-of-order execution." #-}
+runSingleSetup :: NonEmpty (Fixture ()) -> (Options -> SpecWith TestEnvironment) -> SpecWith TestEnvironment
+runSingleSetup fixtures tests = do
+  runWithLocalTestEnvironmentSingleSetup fixtures (\opts -> beforeWith (\(te, ()) -> return te) (tests opts))
+
 -- | Runs the given tests, for each provided 'Fixture'@ a@.
 --
 -- Each 'Fixture' provides a list of 'SetupActions';
@@ -56,27 +73,45 @@ run fixtures tests = do
 -- 'Fixture's are parameterized by the type of local testEnvironment that needs
 -- to be carried throughout the tests.
 --
+-- This function runs setup and teardown for each Spec item individually.
+--
 -- See 'Fixture' for details.
 runWithLocalTestEnvironment ::
   forall a.
   NonEmpty (Fixture a) ->
   (Options -> SpecWith (TestEnvironment, a)) ->
   SpecWith TestEnvironment
-runWithLocalTestEnvironment fixtures tests =
-  for_ fixtures \context -> do
-    let n = name context
-        co = customOptions context
+runWithLocalTestEnvironment = runWithLocalTestEnvironmentInternal aroundWith
+
+{-# DEPRECATED runWithLocalTestEnvironmentSingleSetup "runWithLocalTestEnvironmentSingleSetup lets all specs in a Fixture share a single database environment, which impedes parallelisation and out-of-order execution." #-}
+runWithLocalTestEnvironmentSingleSetup ::
+  forall a.
+  NonEmpty (Fixture a) ->
+  (Options -> SpecWith (TestEnvironment, a)) ->
+  SpecWith TestEnvironment
+runWithLocalTestEnvironmentSingleSetup = runWithLocalTestEnvironmentInternal aroundAllWith
+
+runWithLocalTestEnvironmentInternal ::
+  forall a.
+  ((ActionWith (TestEnvironment, a) -> ActionWith (TestEnvironment)) -> SpecWith (TestEnvironment, a) -> SpecWith (TestEnvironment)) ->
+  NonEmpty (Fixture a) ->
+  (Options -> SpecWith (TestEnvironment, a)) ->
+  SpecWith TestEnvironment
+runWithLocalTestEnvironmentInternal aroundSomeWith fixtures tests =
+  for_ fixtures \fixture' -> do
+    let n = name fixture'
+        co = customOptions fixture'
         options = fromMaybe defaultOptions co
     case skipTests options of
       Just skipMsg ->
-        describe (show n) $ aroundWith (\_ _ -> pendingWith $ "Tests skipped: " <> T.unpack skipMsg) (tests options)
+        describe (show n) $ aroundSomeWith (\_ _ -> pendingWith $ "Tests skipped: " <> T.unpack skipMsg) (tests options)
       Nothing ->
-        describe (show n) $ aroundAllWith (fixtureBracket context) (tests options)
+        describe (show n) $ aroundSomeWith (fixtureBracket fixture') (tests options)
 
 -- We want to be able to report exceptions happening both during the tests
 -- and at teardown, which is why we use a custom re-implementation of
 -- @bracket@.
-fixtureBracket :: Fixture b -> ((TestEnvironment, b) -> IO a) -> TestEnvironment -> IO ()
+fixtureBracket :: Fixture b -> (ActionWith (TestEnvironment, b)) -> ActionWith TestEnvironment
 fixtureBracket Fixture {name, mkLocalTestEnvironment, setupTeardown} actionWith globalTestEnvironment =
   mask \restore -> do
     -- log DB of test