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Sensors previously only tracked alarm thresholds (alert_min/alert_max). Missing the third piece of standard process control: the SETPOINT — what the heater/chiller controls toward and what dashboards compare against. Without it an operator can't tell whether 89°C is "on target" or "barely still in spec". Schema changes: **fusion.plating.bath.parameter** (shop-wide default) - New `target_value` field — the default setpoint for this parameter across the shop (e.g. 87°C for ENP bath). Parallel to existing target_min / target_max. **fp.tank.sensor** (per-sensor override) - New `target_value_override` — per-sensor override, zero = inherit from parameter. Matches the existing override pattern for alert thresholds so users can fine-tune per-tank without touching the shop-wide spec. - New `effective_target` / `effective_target_unit` computed — resolves override → parameter default, converts to company-preferred unit. - New `_get_setpoint()` helper for internal use. **fp.tank.reading** - New `deviation_from_target` — signed Δ from the sensor's effective setpoint, in the company's preferred unit. Positive = above, negative = below, zero if no setpoint defined. - New `deviation_band` (selection: on/near/far/out/none) — coarse band for fast visual scanning. `on` = within ±1° of target, `near` = ±3°, `far` = beyond, `out` = actually out of the alarm band. **Views** - Sensor form: split the alerting panel into two groups — "Target (setpoint)" on the left, "Alarm band" on the right. Makes the distinction between "where we want to be" and "where we'd panic" visually obvious. - Reading list: new Δ + band columns, with decoration classes (success/info/warning/danger) so the list reads at a glance. - Tank form Sensors tab: inline setpoint + unit column. Seeded: parameter "Bath Temperature (Hot Process)" now carries target_value=87°C as a realistic ENP shop default. Sensors inherit unless they set their own override. Design decisions kept simple: - Did NOT add a warning band (warn_min/warn_max). Two-tier model (setpoint + alarm band) is enough for the pilot. Can add soft warnings later as a separate commit if ops wants them. - Did NOT auto-control heaters. Setpoint is stored as metadata only; actual heater actuation via IoT is a future phase C project. Verified: setpoint 87°C stored → displays 188.60°F on the live pilot sensor (company pref = F). Each incoming reading correctly computes signed deviation; bands colour the reading list appropriately. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>