diff --git a/fixtures/filter.json b/fixtures/filter.json
index 5ce1415..8b39dfa 100644
--- a/fixtures/filter.json
+++ b/fixtures/filter.json
@@ -87,6 +87,34 @@
                       "type": "string"
                     }
                   }
+                },
+                "schedule": {
+                  "type": [
+                    "opening_hours",
+                    "null"
+                  ]
+                }
+              }
+            },
+            "opening_hours": {
+              "type": "object",
+              "properties": {
+                "open": {
+                  "type": "string"
+                },
+                "seasons": {
+                  "type": "array",
+                  "items": {
+                    "type": "season"
+                  }
+                }
+              }
+            },
+            "season": {
+              "type": "object",
+              "properties": {
+                "label": {
+                  "type": "string"
                 }
               }
             }
@@ -483,7 +511,9 @@
                   ]
                 }
               }
-            }
+            },
+            "opening_hours": {},
+            "season": {}
           }
         }
       }
diff --git a/src/database/compile/filter.rs b/src/database/compile/filter.rs
index 2474432..06e5c4d 100644
--- a/src/database/compile/filter.rs
+++ b/src/database/compile/filter.rs
@@ -165,8 +165,16 @@ impl Schema {
         } else if db.enums.contains_key(custom) {
           Some(vec![format!("{}.condition", custom)])
         } else {
-          // Assume anything else is a Relational cross-boundary that already has its own .filter dynamically built
-          Some(vec![format!("{}.filter", custom)])
+          // Only a Table-Backed boundary has a synthesized Composed Filter to proxy to.
+          // A Field-Backed JSONB Bubble has none — omit it like an inline object rather
+          // than emit a dangling proxy reference, which breaks eager consumers of the
+          // exported registry (downstream code generators).
+          let base = custom.split('.').next_back().unwrap_or(custom);
+          if db.types.contains_key(base) {
+            Some(vec![format!("{}.filter", custom)])
+          } else {
+            None
+          }
         }
       }
     }