put subzero dependency under a feature flag

Cargo.lock

@@ -7107,6 +7107,7 @@ checksum = "81cdd64d312baedb58e21336b31bc043b77e01cc99033ce76ef539f78e965ebc"
 [[package]]
 name = "subzero-core"
 version = "3.0.1"
+source = "git+https://github.com/neondatabase-labs/subzero?rev=35e8f59d57404f57cbc84f7c486cbbc147602c98#35e8f59d57404f57cbc84f7c486cbbc147602c98"
 dependencies = [
  "base64 0.22.1",
  "csv",

Cargo.toml

@@ -207,9 +207,6 @@ tonic = { version = "0.13.1", default-features = false, features = ["channel", "
 tonic-reflection = { version = "0.13.1", features = ["server"] }
 tower = { version = "0.5.2", default-features = false }
 tower-http = { version = "0.6.2", features = ["auth", "request-id", "trace"] }
-subzero-core = { version = "3.0.1", path = "../subzero/core", features = ["postgresql"] }
-jsonpath_lib = "0.3.0"
-ouroboros = "0.18"
 
 # This revision uses opentelemetry 0.27. There's no tag for it.
 tower-otel = { git = "https://github.com/mattiapenati/tower-otel", rev = "56a7321053bcb72443888257b622ba0d43a11fcd" }

proxy/Cargo.toml

@@ -5,8 +5,9 @@ edition = "2024"
 license.workspace = true
 
 [features]
-default = []
+default = ["subzero"]
 testing = ["dep:tokio-postgres"]
+subzero = ["subzero-core", "jsonpath_lib", "ouroboros"]
 
 [dependencies]
 ahash.workspace = true
@@ -103,9 +104,9 @@ uuid.workspace = true
 x509-cert.workspace = true
 redis.workspace = true
 zerocopy.workspace = true
-subzero-core.workspace = true
-jsonpath_lib.workspace = true
-ouroboros.workspace = true
+subzero-core = { git = "https://github.com/neondatabase-labs/subzero", rev = "35e8f59d57404f57cbc84f7c486cbbc147602c98", features = ["postgresql"], optional = true }
+jsonpath_lib = { version = "0.3.0", optional = true }
+ouroboros = { version = "0.18", optional = true }
 
 # jwt stuff
 jose-jwa = "0.1.2"