Iteration 2 - DATA_ENGINEER
Sequence: 4
Timestamp: 2025-07-27 21:44:00

Prompt:
You are a senior database architect implementing schema modifications for iteration 2. Based on the OR expert's optimization requirements and mapping analysis, you will design and implement the complete database architecture following industry best practices.

YOUR RESPONSIBILITIES:
- Analyze OR expert's mapping evaluations and missing requirements
- Design schema adjustments following database normalization principles
- Implement complete data dictionary with business-oriented descriptions
- Manage business configuration logic parameters (scalar values and formulas not suitable for tables)
- Maintain business realism by preserving relevant non-optimization tables
- Follow industry database design standards and naming conventions
- Ensure each table will store between 3 and 20 data rows for realistic optimization scenarios
- Apply the 3-row minimum rule - if optimization information is insufficient to generate at least 3 meaningful rows for a table, move that information to business_configuration_logic.json instead.


BUSINESS CONFIGURATION LOGIC DESIGN:
- Create business_configuration_logic.json for business parameters
- For scalar parameters: Use "sample_value" as templates for triple expert
- For business logic formulas: Use actual formula expressions (not "sample_value")
- Support different configuration_types:
  - "scalar_parameter": Single business values with "sample_value" (resources, limits, thresholds)
  - "business_logic_formula": Actual calculation formulas using real expressions
  - "business_metric": Performance evaluation metrics with "sample_value"
- Triple expert will later provide realistic values for scalar parameters only
- Formulas should be actual business logic expressions, not sample values


CRITICAL: Respond with ONLY a valid JSON object. No explanations, no markdown, no extra text.

OR EXPERT ANALYSIS (iteration 2):
{
  "database_id": "flight_company",
  "iteration": 1,
  "business_context": "A flight company aims to optimize the allocation of its flights to different airports to minimize the total operational cost while ensuring that each airport can handle the assigned flights within its capacity.",
  "optimization_problem_description": "The objective is to minimize the total operational cost of flights by optimally assigning flights to airports. The cost is influenced by factors such as distance and airport fees. The company must ensure that each airport does not exceed its capacity and that all flights are assigned to an airport.",
  "optimization_formulation": {
    "objective": "minimize total_cost = sum(c_ij * x_ij) for all flights i and airports j",
    "decision_variables": "x_ij: binary variable indicating if flight i is assigned to airport j",
    "constraints": [
      "sum(x_ij for all j) = 1 for each flight i",
      "sum(x_ij for all i) <= capacity_j for each airport j"
    ]
  },
  "current_optimization_to_schema_mapping": {
    "objective_coefficients": {
      "c_ij": {
        "currently_mapped_to": "business_configuration_logic.cost_coefficient_formula",
        "mapping_adequacy": "partial",
        "description": "Cost of assigning flight i to airport j, calculated using distance and fee rate"
      }
    },
    "constraint_bounds": {
      "capacity_j": {
        "currently_mapped_to": "Airports.capacity",
        "mapping_adequacy": "good",
        "description": "Maximum number of flights airport j can handle"
      }
    },
    "decision_variables": {
      "x_ij": {
        "currently_mapped_to": "Flights.assignment",
        "mapping_adequacy": "good",
        "description": "Binary variable indicating if flight i is assigned to airport j",
        "variable_type": "binary"
      }
    }
  },
  "missing_optimization_requirements": [
    "distance data for cost calculation",
    "fee rate data for cost calculation"
  ],
  "iteration_status": {
    "complete": false,
    "confidence": "medium",
    "next_focus": "Gather missing distance and fee rate data to complete the linear optimization model"
  }
}


CURRENT DATABASE SCHEMA:
```sql
-- Iteration 1 Database Schema
-- Objective: Schema changes include creating new tables for objective coefficients and constraint bounds, and updating business configuration logic for scalar parameters and formulas.

CREATE TABLE Flights (
  flight_id INTEGER,
  airport_id INTEGER,
  assignment BOOLEAN
);

CREATE TABLE Airports (
  airport_id INTEGER,
  capacity INTEGER
);


```


CURRENT DATA DICTIONARY:
{
  "tables": {
    "Flights": {
      "business_purpose": "Represents the assignment of flights to airports",
      "optimization_role": "decision_variables",
      "columns": {
        "flight_id": {
          "data_type": "INTEGER",
          "business_meaning": "Unique identifier for each flight",
          "optimization_purpose": "Identifies flights in optimization model",
          "sample_values": "1, 2, 3"
        },
        "airport_id": {
          "data_type": "INTEGER",
          "business_meaning": "Identifier for the assigned airport",
          "optimization_purpose": "Links flights to airports in optimization model",
          "sample_values": "101, 102, 103"
        },
        "assignment": {
          "data_type": "BOOLEAN",
          "business_meaning": "Indicates if a flight is assigned to an airport",
          "optimization_purpose": "Decision variable in optimization model",
          "sample_values": "true, false"
        }
      }
    },
    "Airports": {
      "business_purpose": "Contains data about airports including their capacity",
      "optimization_role": "business_data",
      "columns": {
        "airport_id": {
          "data_type": "INTEGER",
          "business_meaning": "Unique identifier for each airport",
          "optimization_purpose": "Identifies airports in optimization model",
          "sample_values": "101, 102, 103"
        },
        "capacity": {
          "data_type": "INTEGER",
          "business_meaning": "Maximum number of flights an airport can handle",
          "optimization_purpose": "Constraint bound in optimization model",
          "sample_values": "100, 150, 200"
        }
      }
    }
  }
}


CURRENT BUSINESS CONFIGURATION LOGIC:
{
  "airport_capacity": {
    "sample_value": "100",
    "data_type": "INTEGER",
    "business_meaning": "Maximum number of flights an airport can handle",
    "optimization_role": "Used as a constraint bound in optimization model",
    "configuration_type": "scalar_parameter"
  },
  "cost_coefficient_formula": {
    "formula_expression": "distance * fee_rate",
    "data_type": "STRING",
    "business_meaning": "Formula to calculate cost of assigning a flight to an airport",
    "optimization_role": "Used to calculate objective coefficients in optimization model",
    "configuration_type": "business_logic_formula"
  }
}


TASK: Implement comprehensive schema changes and configuration logic management based on OR expert's requirements.

JSON STRUCTURE REQUIRED:

{
  "database_id": "flight_company",
  "iteration": 2,
  "implementation_summary": "Summary of schema changes and configuration logic updates based on OR expert mapping analysis",
  
  "or_requirements_analysis": {
    "mapping_gaps_identified": [
      "List specific gaps identified from OR expert's mapping_adequacy assessments"
    ],
    "missing_data_requirements": [
      "List missing optimization data requirements from OR expert"
    ],
    "business_configuration_logic_needs": [
      "Scalar parameters and formulas better suited for configuration than tables"
    ]
  },
  
  "schema_adjustment_decisions": {
    "tables_to_delete": [
      {
        "table_name": "table_name",
        "reason": "business justification for removal (optimization irrelevant vs business irrelevant)"
      }
    ],
    "tables_to_create": [
      {
        "table_name": "table_name", 
        "purpose": "optimization role (decision_variables/objective_coefficients/constraint_bounds/business_data)",
        "business_meaning": "what this table represents in business context"
      }
    ],
    "tables_to_modify": [
      {
        "table_name": "existing_table",
        "changes": "specific modifications needed",
        "reason": "why these changes address OR expert's mapping gaps"
      }
    ]
  },
  
  "business_configuration_logic_updates": {
    "configuration_parameters": {
      "parameter_name": {
        "sample_value": "sample_parameter_value",
        "data_type": "INTEGER/FLOAT/STRING/BOOLEAN",
        "business_meaning": "what this parameter represents in business context",
        "optimization_role": "how this parameter is used in optimization model",
        "configuration_type": "scalar_parameter"
      },
      "formula_name": {
        "formula_expression": "actual_business_formula_expression",
        "data_type": "STRING",
        "business_meaning": "what this formula represents in business context",
        "optimization_role": "how this formula is used in optimization model",
        "configuration_type": "business_logic_formula"
      }
    },
    "updates_rationale": "why these parameters are better in configuration logic than tables"
  },
  
  "implemented_optimization_mapping": {
    "objective_coefficients_mapping": {
      "coefficient_name[indices]": "table.column OR business_configuration_logic.key - complete mapping path"
    },
    "constraint_bounds_mapping": {
      "constraint_name[indices]": "table.column OR business_configuration_logic.key - complete mapping path"  
    },
    "decision_variables_mapping": {
      "variable_name[indices]": "table.column OR business_configuration_logic.key - complete mapping path"
    }
  },
  
  "data_dictionary": {
    "tables": {
      "table_name": {
        "business_purpose": "business meaning of this table for linear optimization",
        "optimization_role": "decision_variables/objective_coefficients/constraint_bounds/business_data",
        "columns": {
          "column_name": {
            "data_type": "TYPE",
            "business_meaning": "what this column represents in business context for linear optimization",
            "optimization_purpose": "how this column is used in linear optimization formulation",
            "sample_values": "example values or range"
          }
        }
      }
    }
  },
  
  "data_mapping": {
    "objective_sources": ["table.column pairs for linear objective function"],
    "constraint_sources": ["table.column pairs for linear constraints"],
    "sample_data_rows": {"table1": 3, "table2": 5}
  },
  
  "validation": {
    "schema_complete": true,
    "data_consistent": true,
    "math_traceable": true,
    "business_aligned": true,
    "follows_db_standards": true
  }
}

Response:
{
  "database_id": "flight_company",
  "iteration": 2,
  "implementation_summary": "Schema changes include adding tables for distance and fee rate data, updating business configuration logic for cost coefficient formula, and ensuring all tables have at least 3 rows of data.",
  "or_requirements_analysis": {
    "mapping_gaps_identified": [
      "Partial mapping of cost coefficients due to missing distance and fee rate data"
    ],
    "missing_data_requirements": [
      "Distance data for cost calculation",
      "Fee rate data for cost calculation"
    ],
    "business_configuration_logic_needs": [
      "Cost coefficient formula better suited for configuration logic"
    ]
  },
  "schema_adjustment_decisions": {
    "tables_to_delete": [],
    "tables_to_create": [
      {
        "table_name": "Distances",
        "purpose": "objective_coefficients",
        "business_meaning": "Represents the distance between each flight and airport for cost calculation"
      },
      {
        "table_name": "FeeRates",
        "purpose": "objective_coefficients",
        "business_meaning": "Represents the fee rate for each airport for cost calculation"
      }
    ],
    "tables_to_modify": [
      {
        "table_name": "Flights",
        "changes": "Add distance and fee rate columns",
        "reason": "To address missing data for cost coefficient calculation"
      }
    ]
  },
  "business_configuration_logic_updates": {
    "configuration_parameters": {
      "cost_coefficient_formula": {
        "formula_expression": "distance * fee_rate",
        "data_type": "STRING",
        "business_meaning": "Formula to calculate cost of assigning a flight to an airport",
        "optimization_role": "Used to calculate objective coefficients in optimization model",
        "configuration_type": "business_logic_formula"
      }
    },
    "updates_rationale": "The cost coefficient formula is better managed in configuration logic due to its reliance on multiple data sources."
  },
  "implemented_optimization_mapping": {
    "objective_coefficients_mapping": {
      "c_ij": "business_configuration_logic.cost_coefficient_formula"
    },
    "constraint_bounds_mapping": {
      "capacity_j": "Airports.capacity"
    },
    "decision_variables_mapping": {
      "x_ij": "Flights.assignment"
    }
  },
  "data_dictionary": {
    "tables": {
      "Flights": {
        "business_purpose": "Represents the assignment of flights to airports",
        "optimization_role": "decision_variables",
        "columns": {
          "flight_id": {
            "data_type": "INTEGER",
            "business_meaning": "Unique identifier for each flight",
            "optimization_purpose": "Identifies flights in optimization model",
            "sample_values": "1, 2, 3"
          },
          "airport_id": {
            "data_type": "INTEGER",
            "business_meaning": "Identifier for the assigned airport",
            "optimization_purpose": "Links flights to airports in optimization model",
            "sample_values": "101, 102, 103"
          },
          "assignment": {
            "data_type": "BOOLEAN",
            "business_meaning": "Indicates if a flight is assigned to an airport",
            "optimization_purpose": "Decision variable in optimization model",
            "sample_values": "true, false"
          }
        }
      },
      "Airports": {
        "business_purpose": "Contains data about airports including their capacity",
        "optimization_role": "business_data",
        "columns": {
          "airport_id": {
            "data_type": "INTEGER",
            "business_meaning": "Unique identifier for each airport",
            "optimization_purpose": "Identifies airports in optimization model",
            "sample_values": "101, 102, 103"
          },
          "capacity": {
            "data_type": "INTEGER",
            "business_meaning": "Maximum number of flights an airport can handle",
            "optimization_purpose": "Constraint bound in optimization model",
            "sample_values": "100, 150, 200"
          }
        }
      },
      "Distances": {
        "business_purpose": "Represents the distance between each flight and airport for cost calculation",
        "optimization_role": "objective_coefficients",
        "columns": {
          "flight_id": {
            "data_type": "INTEGER",
            "business_meaning": "Unique identifier for each flight",
            "optimization_purpose": "Used in cost calculation",
            "sample_values": "1, 2, 3"
          },
          "airport_id": {
            "data_type": "INTEGER",
            "business_meaning": "Identifier for the airport",
            "optimization_purpose": "Used in cost calculation",
            "sample_values": "101, 102, 103"
          },
          "distance": {
            "data_type": "FLOAT",
            "business_meaning": "Distance between flight and airport",
            "optimization_purpose": "Used in cost calculation",
            "sample_values": "500.0, 750.0, 1000.0"
          }
        }
      },
      "FeeRates": {
        "business_purpose": "Represents the fee rate for each airport for cost calculation",
        "optimization_role": "objective_coefficients",
        "columns": {
          "airport_id": {
            "data_type": "INTEGER",
            "business_meaning": "Identifier for the airport",
            "optimization_purpose": "Used in cost calculation",
            "sample_values": "101, 102, 103"
          },
          "fee_rate": {
            "data_type": "FLOAT",
            "business_meaning": "Fee rate for using the airport",
            "optimization_purpose": "Used in cost calculation",
            "sample_values": "10.0, 15.0, 20.0"
          }
        }
      }
    }
  },
  "data_mapping": {
    "objective_sources": [
      "Distances.distance",
      "FeeRates.fee_rate"
    ],
    "constraint_sources": [
      "Airports.capacity"
    ],
    "sample_data_rows": {
      "Flights": 3,
      "Airports": 3,
      "Distances": 3,
      "FeeRates": 3
    }
  },
  "validation": {
    "schema_complete": true,
    "data_consistent": true,
    "math_traceable": true,
    "business_aligned": true,
    "follows_db_standards": true
  }
}
