feat: Enhance dashboard metrics and summary statistics

- Added new summary fields: variance, 5th percentile, 95th percentile, VaR (95%), and expected shortfall (95%) to the dashboard.
- Updated the display logic for summary metrics to handle non-finite values gracefully.
- Modified the chart rendering to include additional percentile points and tail risk metrics in tooltips.

test: Introduce unit tests for consumption, costs, and other modules

- Created a comprehensive test suite for consumption, costs, equipment, maintenance, production, reporting, and simulation modules.
- Implemented fixtures for database setup and teardown using an in-memory SQLite database for isolated testing.
- Added tests for creating, listing, and validating various entities, ensuring proper error handling and response validation.

refactor: Consolidate parameter tests and remove deprecated files

- Merged parameter-related tests into a new test file for better organization and clarity.
- Removed the old parameter test file that was no longer in use.
- Improved test coverage for parameter creation, listing, and validation scenarios.

fix: Ensure proper validation and error handling in API endpoints

- Added validation to reject negative amounts in consumption and production records.
- Implemented checks to prevent duplicate scenario creation and ensure proper error messages are returned.
- Enhanced reporting endpoint tests to validate input formats and expected outputs.

tests/unit/test_scenario.py

@@ -1,14 +1,9 @@
-# ensure project root is on sys.path for module imports
-from main import app
-from routes.scenarios import router
-from config.database import Base, engine
-from fastapi.testclient import TestClient
-import pytest
-import os
-import sys
-sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
+from uuid import uuid4
 
-# Create tables for testing
+from fastapi.testclient import TestClient
+
+from config.database import Base, engine
+from main import app
 
 
 def setup_module(module):
@@ -23,14 +18,28 @@ client = TestClient(app)
 
 
 def test_create_and_list_scenario():
-    # Create a scenario
+    scenario_name = f"Scenario-{uuid4()}"
     response = client.post(
-        "/api/scenarios/", json={"name": "Test", "description": "Desc"})
+        "/api/scenarios/",
+        json={"name": scenario_name, "description": "Integration test"},
+    )
     assert response.status_code == 200
     data = response.json()
-    assert data["name"] == "Test"
-    # List scenarios
+    assert data["name"] == scenario_name
+
     response2 = client.get("/api/scenarios/")
     assert response2.status_code == 200
     data2 = response2.json()
-    assert any(s["name"] == "Test" for s in data2)
+    assert any(s["name"] == scenario_name for s in data2)
+
+
+def test_create_duplicate_scenario_rejected():
+    scenario_name = f"Duplicate-{uuid4()}"
+    payload = {"name": scenario_name, "description": "Primary"}
+
+    first_resp = client.post("/api/scenarios/", json=payload)
+    assert first_resp.status_code == 200
+
+    second_resp = client.post("/api/scenarios/", json=payload)
+    assert second_resp.status_code == 400
+    assert second_resp.json()["detail"] == "Scenario already exists"