{
  "name": "cs8-fixed-v4",
  "condition": "fixed",
  "version": "v4",
  "description": "CS8 fixed-mapping condition v4. T2 alias group redesigned: whs/budg/srvc (low first-subtoken fan-out) replaced by tsk/brc/prj (fan-out >=712) to ensure all T2 aliases commit late. NL-SQL aggregate mismatch fix from v3 retained.",
  "changes_from_v3": {
    "removed": [
      {
        "alias": "whs",
        "table": "warehouses",
        "reason": "first-subtoken \u0120wh fan-out=61 \u2192 commits early"
      },
      {
        "alias": "budg",
        "table": "budgets",
        "reason": "first-subtoken \u0120bud fan-out=8 \u2192 commits early"
      },
      {
        "alias": "srvc",
        "table": "services",
        "reason": "first-subtoken \u0120sr fan-out=4 \u2192 commits early"
      }
    ],
    "added": [
      {
        "alias": "tsk",
        "table": "tasks",
        "first_subtoken": "\u0120t",
        "fan_out": 1586
      },
      {
        "alias": "brc",
        "table": "branches",
        "first_subtoken": "\u0120b",
        "fan_out": 1329
      },
      {
        "alias": "prj",
        "table": "projects",
        "first_subtoken": "\u0120pr",
        "fan_out": 712
      }
    ]
  },
  "regression_evidence": {
    "dataset": "CS7-fixed-v2, seed s42, n=18 aliases",
    "M1_R2_tokenization_only": 0.465,
    "M2_R2_prior_only": 0.046,
    "M3_R2_both": 0.51,
    "unique_R2_tokenization": 0.464,
    "unique_R2_prior": 0.044,
    "interpretation": "Tokenization type (T1/T2) is dominant predictor; prior strength negligible confound."
  },
  "alias_groups": {
    "T1": [
      "emp",
      "inv",
      "txn",
      "mgr",
      "ord",
      "prod",
      "cust",
      "dept",
      "acct",
      "sale"
    ],
    "T2": [
      "tsk",
      "brc",
      "rgn",
      "lne",
      "prj",
      "empl",
      "ordr",
      "catg",
      "schd",
      "shp"
    ]
  },
  "table_alias_map": {
    "employees": "emp",
    "invoices": "inv",
    "transactions": "txn",
    "managers": "mgr",
    "orders": "ord",
    "products": "prod",
    "customers": "cust",
    "departments": "dept",
    "accounts": "acct",
    "sales": "sale",
    "tasks": "tsk",
    "branches": "brc",
    "regions": "rgn",
    "items": "lne",
    "projects": "prj",
    "staff": "empl",
    "requests": "ordr",
    "categories": "catg",
    "schedules": "schd",
    "shipments": "shp"
  },
  "fan_out_by_alias": {
    "emp": 1,
    "inv": 1,
    "txn": 1,
    "mgr": 1,
    "ord": 1,
    "prod": 1,
    "cust": 1,
    "dept": 1,
    "acct": 1,
    "sale": 1,
    "tsk": 1586,
    "brc": 1329,
    "rgn": 1534,
    "lne": 883,
    "prj": 712,
    "empl": 110,
    "ordr": 95,
    "catg": 36,
    "schd": 36,
    "shp": 30
  },
  "split_sizes": {
    "train": 19200,
    "val": 4800
  },
  "examples_per_alias": {
    "train": 960,
    "val": 240
  },
  "generation": {
    "seed": 42,
    "generated_at": "2026-06-02T23:29:40.971229",
    "script": "src/00_data/generate_cs8_fixed_v4.py"
  }
}