fix(data): preserve jsonb numbers for metadata CAS

Cargo.toml

@@ -125,7 +125,7 @@ regex = "1"
 rustls = { version = "0.23", features = ["ring"] }
 semver = "1"
 serde = { version = "1", features = ["derive"] }
-serde_json = { version = "1", features = ["preserve_order"] }
+serde_json = { version = "1", features = ["arbitrary_precision", "preserve_order"] }
 serde_path_to_error = "0.1"
 sha2 = "0.10"
 socket2 = "0.6"

crates/aether-data/adapters/postgres/src/provider_catalog.rs

@@ -3671,6 +3671,17 @@ mod tests {
         assert!(!sql.contains("is_active"));
     }
 
+    #[test]
+    fn runtime_metadata_cas_preserves_postgres_jsonb_numeric_lexemes() {
+        // PostgreSQL jsonb keeps the exact decimal value. Losing that lexeme while
+        // decoding into serde_json::Value makes a subsequent namespace CAS compare
+        // a nearby-but-different number and report a false conflict.
+        let postgres_json = r#"{"used_percent":9.373679999999995}"#;
+        let decoded: serde_json::Value = serde_json::from_str(postgres_json).unwrap();
+
+        assert_eq!(serde_json::to_string(&decoded).unwrap(), postgres_json);
+    }
+
     #[test]
     fn ordinary_key_update_does_not_own_runtime_observation_fields() {
         let sql = super::KEY_UPDATE_SQL.to_ascii_lowercase();