feat(history): persist immutable execution context snapshots

database/operations.py

@@ -12,6 +12,7 @@ from .models import PromptModel, normalize_image_path, utc_now_iso
 from .pairs import PairDependencyError, PairOperations
 from .library import LibraryOperations
 from .execution_history import ExecutionHistoryOperations
+from .execution_contexts import ExecutionContextOperations
 
 # Import logging system
 try:
@@ -152,7 +153,12 @@ def _coerce_file_info(metadata: Any) -> tuple:
     )
 
 
-class PromptDatabase(PairOperations, LibraryOperations, ExecutionHistoryOperations):
+class PromptDatabase(
+    PairOperations,
+    LibraryOperations,
+    ExecutionHistoryOperations,
+    ExecutionContextOperations,
+):
     """Database operations class for managing prompts."""
 
     def __init__(self, db_path: Optional[str] = None):