# L6 — Sensor inventory v0.3 (metadata only)

**Status:** v0.3 rebuild · timestamp provenance columns · explicit units · **NO correlations** · MODEL_CHANGE=NO  
**Data:** `sensor_inventory_v0.3.{csv,json}` · `timestamp_manifests_v0.3.json`  
**Schema:** `density_matrix_schema_v0.3.json`  
**Preserved:** `*_v0*` untouched in `data/lanes/L6/` (+ `_v0_preserved/`)

Rows: 22 sensors. Unverified acquisition/gaps/release dates remain **UNKNOWN**.

## Unit / coverage policy
- Calendar span = inclusive years; **not** observation coverage.
- Congress sensors use `congress_periods` — never labeled as years.
- Consumer sentiment aggregates ≠ authorized M1 measurement (`score_authorized=false`).
- Only `pew_individual_trust_polls` is L1 score-authorized.

## Trust example
| Field | Value |
|-------|-------|
| calendar_span_years_inclusive | 68 (1958–2025) |
| years_with_polls | 53 |
| observation coverage | ≠ calendar span |

## Arithmetic corrections applied
{
  "OPP7": {
    "before": 11,
    "after": 9,
    "unit": "calendar_years_inclusive",
    "sca_raw_months": 108
  },
  "OPP1": {
    "before": {
      "overlap_listed": 48,
      "density_score_meta": 75.0,
      "bug": "pair density on group row"
    },
    "after_pair": {
      "overlap": 75,
      "density_meta_product": 75.0
    },
    "after_group": {
      "overlap": 49,
      "density_meta_product": 49.0
    }
  },
  "OPP4": {
    "before": {
      "overlap_years": 21
    },
    "after": {
      "congress_period_count": 21,
      "calendar_span_years_inclusive_approx": 42
    }
  },
  "trust": {
    "years_with_polls": 53,
    "calendar_span_years_inclusive": 68
  }
}