[
  {
    "task_id": "easy_001",
    "difficulty": "easy",
    "query": "SELCT * FORM users WEHRE id = 1;",
    "schema": {
      "users": {
        "id": "INT PRIMARY KEY",
        "name": "VARCHAR(255)",
        "email": "VARCHAR(255)"
      }
    },
    "context": "Fetch a user profile by id for the account page.",
    "ground_truth_issues": [
      {
        "id": "easy_001_select",
        "category": "syntax",
        "description": "SELCT should be SELECT.",
        "severity": 0.35,
        "fix": "SELECT * FROM users WHERE id = 1;",
        "keywords": [
          "selct", "select", "misspelled", "keyword", "syntax", "typo",
          "spelling", "incorrect keyword", "wrong keyword", "misspelling",
          "invalid keyword", "selct typo"
        ]
      },
      {
        "id": "easy_001_from",
        "category": "syntax",
        "description": "FORM should be FROM.",
        "severity": 0.35,
        "fix": "SELECT * FROM users WHERE id = 1;",
        "keywords": [
          "form", "from", "misspelled", "keyword", "syntax", "typo",
          "spelling", "table reference", "from clause", "misspelling"
        ]
      },
      {
        "id": "easy_001_where",
        "category": "syntax",
        "description": "WEHRE should be WHERE.",
        "severity": 0.25,
        "fix": "SELECT * FROM users WHERE id = 1;",
        "keywords": [
          "wehre", "where", "misspelled", "keyword", "syntax", "typo",
          "filter", "condition", "where clause", "misspelling"
        ]
      },
      {
        "id": "easy_001_projection",
        "category": "performance",
        "description": "SELECT * fetches unnecessary columns for a profile lookup.",
        "severity": 0.15,
        "fix": "SELECT id, name, email FROM users WHERE id = 1;",
        "keywords": [
          "select *", "star", "unnecessary columns", "projection", "performance",
          "all columns", "wildcard", "specific columns", "column selection",
          "over-fetching", "fetch all", "select star"
        ]
      }
    ],
    "max_steps": 5
  },
  {
    "task_id": "easy_002",
    "difficulty": "easy",
    "query": "SELECT id, email users WHERE active = 1;",
    "schema": {
      "users": {
        "id": "INT PRIMARY KEY",
        "email": "VARCHAR(255)",
        "active": "BOOLEAN"
      }
    },
    "context": "List active user emails for a notification job.",
    "ground_truth_issues": [
      {
        "id": "easy_002_missing_from",
        "category": "syntax",
        "description": "The query is missing the FROM clause before users.",
        "severity": 0.6,
        "fix": "SELECT id, email FROM users WHERE active = 1;",
        "keywords": [
          "missing from", "from clause", "syntax", "users", "no from",
          "omitted from", "table reference", "absent from", "from keyword",
          "missing keyword"
        ]
      }
    ],
    "max_steps": 4
  },
  {
    "task_id": "easy_003",
    "difficulty": "easy",
    "query": "SELECT order_id, total FROM orders WHERE shipped_at = NULL;",
    "schema": {
      "orders": {
        "order_id": "INT PRIMARY KEY",
        "total": "DECIMAL(10,2)",
        "shipped_at": "TIMESTAMP NULL"
      }
    },
    "context": "Find orders that still need to ship.",
    "ground_truth_issues": [
      {
        "id": "easy_003_null_check",
        "category": "logic",
        "description": "NULL must be compared with IS NULL instead of = NULL.",
        "severity": 0.7,
        "fix": "SELECT order_id, total FROM orders WHERE shipped_at IS NULL;",
        "keywords": [
          "is null", "= null", "null comparison", "logic", "null check",
          "equals null", "compare null", "null equality", "null predicate",
          "three-valued logic", "null handling"
        ]
      }
    ],
    "max_steps": 4
  },
  {
    "task_id": "easy_004",
    "difficulty": "easy",
    "query": "SELECT name FROM customers WHERE city = 'Boston;",
    "schema": {
      "customers": {
        "id": "INT PRIMARY KEY",
        "name": "VARCHAR(255)",
        "city": "VARCHAR(128)"
      }
    },
    "context": "Filter customers who live in Boston.",
    "ground_truth_issues": [
      {
        "id": "easy_004_unclosed_quote",
        "category": "syntax",
        "description": "The string literal is not terminated with a closing quote.",
        "severity": 0.75,
        "fix": "SELECT name FROM customers WHERE city = 'Boston';",
        "keywords": [
          "unclosed quote", "unterminated string", "syntax", "quote",
          "missing quote", "string literal", "closing quote", "open quote",
          "single quote", "unmatched quote", "parse error"
        ]
      }
    ],
    "max_steps": 4
  },
  {
    "task_id": "easy_005",
    "difficulty": "easy",
    "query": "SELECT id, statuz FROM orders WHERE status = 'paid';",
    "schema": {
      "orders": {
        "id": "INT PRIMARY KEY",
        "status": "VARCHAR(32)",
        "total": "DECIMAL(10,2)",
        "created_at": "TIMESTAMP"
      }
    },
    "context": "List paid orders for revenue accounting.",
    "ground_truth_issues": [
      {
        "id": "easy_005_bad_column",
        "category": "logic",
        "description": "Column statuz does not exist; the intended column is status.",
        "severity": 0.65,
        "fix": "SELECT id, status FROM orders WHERE status = 'paid';",
        "keywords": [
          "unknown column", "statuz", "status", "column name", "typo",
          "misspelled column", "invalid column", "column not found",
          "does not exist", "wrong column", "nonexistent column"
        ]
      }
    ],
    "max_steps": 4
  },
  {
    "task_id": "easy_006",
    "difficulty": "easy",
    "query": "DELETE FROM orders;",
    "schema": {
      "orders": {
        "id": "INT PRIMARY KEY",
        "user_id": "INT",
        "total": "DECIMAL(10,2)",
        "status": "VARCHAR(32)"
      }
    },
    "context": "Remove cancelled orders from the database.",
    "ground_truth_issues": [
      {
        "id": "easy_006_no_where",
        "category": "logic",
        "description": "DELETE without WHERE clause will remove ALL rows from the table.",
        "severity": 1.0,
        "fix": "DELETE FROM orders WHERE status = 'cancelled';",
        "keywords": [
          "delete", "no where", "missing where", "all rows", "dangerous",
          "destructive", "entire table", "unfiltered delete", "data loss",
          "without condition", "unconditional"
        ]
      }
    ],
    "max_steps": 4
  },
  {
    "task_id": "easy_007",
    "difficulty": "easy",
    "query": "SELECT id FROM users WHERE email = email;",
    "schema": {
      "users": {
        "id": "INT PRIMARY KEY",
        "email": "VARCHAR(255)"
      }
    },
    "context": "Find user by email for login lookup.",
    "ground_truth_issues": [
      {
        "id": "easy_007_self_compare",
        "category": "logic",
        "description": "Comparing column to itself (email = email) is always true. Should compare to a string literal.",
        "severity": 0.8,
        "fix": "SELECT id FROM users WHERE email = 'user@example.com';",
        "keywords": [
          "self comparison", "column compared to itself", "always true",
          "tautology", "email = email", "missing literal", "missing value",
          "string literal", "parameter", "no filter"
        ]
      }
    ],
    "max_steps": 4
  }
]