refactor: replace Pydantic BaseModel with dataclasses

Replace Pydantic BaseModel with Python's native dataclasses across schema files to reduce dependencies and simplify codebase. This includes updating field ordering to comply with dataclass requirements (fields with defaults must come after fields without defaults).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: mdesmet

src/datapilot/core/insights/schema.py

@@ -1,16 +1,16 @@
+from dataclasses import dataclass
 from enum import Enum
 from typing import Dict
 
-from pydantic import BaseModel
-
 
 class Severity(Enum):
     INFO = "INFO"
     WARNING = "WARNING"
     ERROR = "ERROR"
 
 
-class InsightResult(BaseModel):
+@dataclass
+class InsightResult:
     name: str
     type: str
     message: str
@@ -19,6 +19,7 @@ class InsightResult(BaseModel):
     metadata: Dict
 
 
-class InsightResponse(BaseModel):
+@dataclass
+class InsightResponse:
     insight: InsightResult
     severity: Severity = Severity.ERROR

src/datapilot/core/platforms/dbt/schemas/catalog.py

@@ -1,56 +1,61 @@
+from dataclasses import dataclass
 from datetime import datetime
 from typing import ClassVar
 from typing import Dict
 from typing import List
 from typing import Optional
 from typing import Union
 
-from pydantic.main import BaseModel
-
 from vendor.dbt_artifacts_parser.parsers.catalog.catalog_v1 import CatalogV1 as BaseCatalogV1
 from vendor.dbt_artifacts_parser.parsers.catalog.catalog_v1 import Metadata as BaseMetadata
 
 
-class AltimateCatalogMetadata(BaseModel):
+@dataclass
+class AltimateCatalogMetadata:
     dbt_schema_version: Optional[str] = "https://schemas.getdbt.com/dbt/catalog/v1.json"
     dbt_version: Optional[str] = "0.19.0"
     generated_at: Optional[datetime] = "2021-02-10T04:42:33.680487Z"
     invocation_id: Optional[Optional[str]] = None
     env: ClassVar[Optional[Dict[str, str]]] = {}
 
 
-class AltimateCatalogTableMetadata(BaseModel):
+@dataclass
+class AltimateCatalogTableMetadata:
     type: str
-    database: Optional[Optional[str]] = None
     schema_name: str
     name: str
+    database: Optional[Optional[str]] = None
     comment: Optional[Optional[str]] = None
     owner: Optional[Optional[str]] = None
 
 
-class AltimateCatalogColumnMetadata(BaseModel):
+@dataclass
+class AltimateCatalogColumnMetadata:
     type: str
-    comment: Optional[Optional[str]] = None
     index: int
     name: str
+    comment: Optional[Optional[str]] = None
 
 
-class AltimateCatalogStatsItem(BaseModel):
+@dataclass
+class AltimateCatalogStatsItem:
     id: str
     label: str
+    include: bool
     value: Optional[Optional[Union[bool, str, float]]] = None
     description: Optional[Optional[str]] = None
-    include: bool
 
 
-class AltimateCatalogTable(BaseModel):
+@dataclass
+class AltimateCatalogTable:
     metadata: AltimateCatalogTableMetadata
     columns: Dict[str, AltimateCatalogColumnMetadata]
     stats: Dict[str, AltimateCatalogStatsItem]
     unique_id: Optional[Optional[str]] = None
 
 
-class AltimateCatalogCatalogV1(BaseModel):
+@dataclass
+class AltimateCatalogCatalogV1:
     metadata: AltimateCatalogMetadata
     nodes: Dict[str, AltimateCatalogTable]
     sources: Dict[str, AltimateCatalogTable]