Skip Repatch for Oracle tests

Author: robacourt

packages/sync-service/test/test_helper.exs

@@ -13,35 +13,44 @@ ExUnit.start(assert_receive_timeout: 400, exclude: [:slow, :oracle], capture_log
 # causing a deadlock when OTP tries to start both applications.
 {:ok, _} = Electric.Client.Application.start(:normal, [])
 
+skip_repatch_prewarm? = System.get_env("SKIP_REPATCH_PREWARM") == "true"
+
 # Repatch in async tests has lazy recompilation issues, so as a temporary fix
 # we force recompilation in the setup. The issue is tracked here:
 # https://github.com/hissssst/repatch/issues/2
-Repatch.setup(
-  recompile: [
-    # IMPORTANT: When adding a new Repatch.patch(..., mode: :shared, ...) in any
-    # test file, add the target module to this list. Omitting it causes rare async
-    # test failures because Repatch recompiles modules on first patch, which
-    # destroys Erlang trace patterns, invalidates ETS table references, and breaks
-    # anonymous function closures in concurrent tests. Pre-warming here triggers
-    # the recompilation once at startup so subsequent patches only update ETS hooks.
-    Postgrex,
-    Plug.Conn,
-    Electric.StatusMonitor,
-    Electric.Telemetry.Sampler,
-    Electric.Connection.Manager,
-    Electric.Connection.Restarter,
-    Electric.Postgres.Configuration,
-    Electric.Postgres.Inspector,
-    Electric.Replication.PublicationManager,
-    Electric.Replication.ShapeLogCollector,
-    Electric.ShapeCache,
-    Electric.ShapeCache.PureFileStorage,
-    Electric.ShapeCache.ShapeCleaner,
-    Electric.ShapeCache.ShapeStatus,
-    Electric.ShapeCache.Storage,
-    Electric.Shapes.Consumer.Snapshotter,
-    Electric.Shapes.DynamicConsumerSupervisor,
-    Electric.Shapes.Shape,
-    :otel_tracer
-  ]
-)
+#
+# Repatch does slow down execution so if needed this prewarm can be skipped
+# by setting the SKIP_REPATCH_PREWARM environment variable to "true".
+# Skipping the prewarm is useful for the postgres oracle tests where performance
+# is critical for high load.
+if not skip_repatch_prewarm? do
+  Repatch.setup(
+    recompile: [
+      # IMPORTANT: When adding a new Repatch.patch(..., mode: :shared, ...) in any
+      # test file, add the target module to this list. Omitting it causes rare async
+      # test failures because Repatch recompiles modules on first patch, which
+      # destroys Erlang trace patterns, invalidates ETS table references, and breaks
+      # anonymous function closures in concurrent tests. Pre-warming here triggers
+      # the recompilation once at startup so subsequent patches only update ETS hooks.
+      Postgrex,
+      Plug.Conn,
+      Electric.StatusMonitor,
+      Electric.Telemetry.Sampler,
+      Electric.Connection.Manager,
+      Electric.Connection.Restarter,
+      Electric.Postgres.Configuration,
+      Electric.Postgres.Inspector,
+      Electric.Replication.PublicationManager,
+      Electric.Replication.ShapeLogCollector,
+      Electric.ShapeCache,
+      Electric.ShapeCache.PureFileStorage,
+      Electric.ShapeCache.ShapeCleaner,
+      Electric.ShapeCache.ShapeStatus,
+      Electric.ShapeCache.Storage,
+      Electric.Shapes.Consumer.Snapshotter,
+      Electric.Shapes.DynamicConsumerSupervisor,
+      Electric.Shapes.Shape,
+      :otel_tracer
+    ]
+  )
+end