Refactor OpenAPI fetcher for improved clarity and robustness

Reorganized and enhanced the OpenAPI fetch logic for better maintainability and error handling. Key updates include improved environment variable validation, more detailed error messages, streamlined configuration loading, and additional safety checks for file paths and directories. Added proper logging and ensured the process flow is easy to trace.

backend/app/data/data.py

@@ -234,11 +234,11 @@ dewars = [
 
 # Define proposals
 proposals = [
-    Proposal(id=1, number="PROPOSAL-FRODO-001"),
-    Proposal(id=2, number="PROPOSAL-GANDALF-002"),
-    Proposal(id=3, number="PROPOSAL-ARAGORN-003"),
-    Proposal(id=4, number="PROPOSAL-SAURON-004"),
-    Proposal(id=5, number="PROPOSAL-MORDOR-005"),
+    Proposal(id=1, number="p20000"),
+    Proposal(id=2, number="p20001"),
+    Proposal(id=3, number="p20002"),
+    Proposal(id=4, number="p20003"),
+    Proposal(id=5, number="p20004"),
 ]
 
 # Define shipment specific dewars

backend/app/database.py

@@ -46,9 +46,11 @@ def get_db():
 # Load only slots (minimal data)
 def load_slots_data(session: Session):
     from .data import slots
+    from .data import proposals
 
     if not session.query(models.Slot).first():  # Load only if no slots exist
         session.add_all(slots)
+        session.add_all(proposals)
         session.commit()