diff --git a/core/db/models.py b/core/db/models.py
index 5cda061..983a6b6 100644
--- a/core/db/models.py
+++ b/core/db/models.py
@@ -164,7 +164,7 @@ class Brand(SQLModel, table=True):
     aliases: List[str] = Field(default_factory=list, sa_column=Column(JSON, nullable=False, server_default='[]'))
     source: BrandSource = "ocr"
     confirmed: bool = False
-    airings: List[str] = Field(default_factory=list, sa_column=Column(JSON, nullable=False, server_default='[]'))
+    airings: List[Dict[str, Any]] = Field(default_factory=list, sa_column=Column(JSON, nullable=False, server_default='[]'))
     total_airings: int = 0
     created_at: Optional[datetime] = Field(default_factory=datetime.utcnow)
     updated_at: Optional[datetime] = Field(default_factory=datetime.utcnow)
diff --git a/core/gpu/models/models.py b/core/gpu/models/models.py
index ca820df..f2a90f5 100644
--- a/core/gpu/models/models.py
+++ b/core/gpu/models/models.py
@@ -115,13 +115,13 @@ class SegmentFieldRequest(BaseModel):
 
 class SegmentFieldResponse(BaseModel):
     """Response from field segmentation."""
-    boundary: List[str] = Field(default_factory=list)
+    boundary: List[List[int]] = Field(default_factory=list)
     coverage: float = 0.0
     mask_b64: str = ""
 
 class SegmentFieldDebugResponse(BaseModel):
     """Response from field segmentation with debug overlay."""
-    boundary: List[str] = Field(default_factory=list)
+    boundary: List[List[int]] = Field(default_factory=list)
     coverage: float = 0.0
     mask_overlay_b64: str = ""
 
diff --git a/modelgen/types.py b/modelgen/types.py
index 274d14a..a9f6883 100644
--- a/modelgen/types.py
+++ b/modelgen/types.py
@@ -8,6 +8,8 @@ Used by generators to convert Python types to target framework types.
 import dataclasses as dc
 from typing import Any, Callable, get_args
 
+from .helpers import get_origin_name
+
 # =============================================================================
 # Django Type Mappings
 # =============================================================================
@@ -38,7 +40,7 @@ DJANGO_SPECIAL: dict[str, str] = {
 
 
 def _get_list_inner(type_hint: Any) -> str:
-    """Get inner type of List[T] for Pydantic."""
+    """Get inner type of List[T] for Pydantic. Recurses for nested generics."""
     args = get_args(type_hint)
     if args:
         inner = args[0]
@@ -46,6 +48,11 @@ def _get_list_inner(type_hint: Any) -> str:
             return {str: "str", int: "int", float: "float", bool: "bool"}[inner]
         if isinstance(inner, type) and dc.is_dataclass(inner):
             return inner.__name__
+        origin = get_origin_name(inner)
+        if origin == "list":
+            return f"List[{_get_list_inner(inner)}]"
+        if origin == "dict":
+            return "Dict[str, Any]"
     return "str"
 
 
@@ -69,7 +76,7 @@ PYDANTIC_RESOLVERS: dict[Any, Callable[[Any], str]] = {
 
 
 def _resolve_ts_list(base: Any) -> str:
-    """Resolve TypeScript list type."""
+    """Resolve TypeScript list type. Recurses for nested generics."""
     args = get_args(base)
     if args:
         inner = args[0]
@@ -81,6 +88,11 @@ def _resolve_ts_list(base: Any) -> str:
             return "boolean[]"
         elif isinstance(inner, type) and dc.is_dataclass(inner):
             return f"{inner.__name__}[]"
+        origin = get_origin_name(inner)
+        if origin == "list":
+            return f"{_resolve_ts_list(inner)}[]"
+        if origin == "dict":
+            return "Record<string, unknown>[]"
     return "string[]"
 
 
diff --git a/ui/common/types/generated.ts b/ui/common/types/generated.ts
index 89cd48c..87bdbd4 100644
--- a/ui/common/types/generated.ts
+++ b/ui/common/types/generated.ts
@@ -117,7 +117,7 @@ export interface Brand {
   aliases: string[];
   source: BrandSource;
   confirmed: boolean;
-  airings: string[];
+  airings: Record<string, unknown>[];
   total_airings: number;
   created_at: string | null;
   updated_at: string | null;