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+# Process Model Overhaul (Issue #2, Sub-project 2)
+
+## Goal
+
+Replace the manually-synced `aktueller_schritt` enum with a data-driven process model. Support multiple Erstgespräche (one per therapist, multiple sessions each), conditional TSS step, and transparent prerequisite indicators on all steps.
+
+## Process flow
+
+4 steps, all visible (except TSS which is conditional). Status derived from data, not stored flags.
+
+### Step 1 — Erstgespräch durchführen
+
+One Erstgespräch per therapist, each spanning one or more sessions (date entries). The Erstgespräch carries a diagnosis (text, e.g. "F32.1") and an optional Dringlichkeitscode (boolean). Both can be set or edited after the initial session — PTV11 often arrives later.
+
+**Status = erledigt** when at least one sprechstunde has a non-NULL diagnosis.
+
+**UI:** List of existing Erstgespräche (therapist name, diagnosis, Dringlichkeitscode badge, session count). Each expandable to show session dates with "Sitzung hinzufügen". An "Erstgespräch hinzufügen" button opens a form: select therapist, first session date, optional diagnosis + Dringlichkeitscode.
+
+### Step 2 — TSS kontaktieren (conditional)
+
+Only visible when any sprechstunde has `dringlichkeitscode = TRUE`. The TSS (Terminservicestelle, reached via 116117) searches for therapists on the user's behalf.
+
+**Status = erledigt** when `nutzer.tss_kontaktiert_datum IS NOT NULL`.
+
+**UI:** Single "TSS kontaktiert" button that stamps today's date. Once done, shows the contact date.
+
+### Step 3 — Eigensuche durchführen
+
+Independent therapist search, documenting contact attempts.
+
+**Status = erledigt** when `COUNT(kontakt WHERE ergebnis IN ('absage','keine_antwort')) >= 5`.
+
+**UI:** Contact stats + link to /kontakte (unchanged from current).
+
+### Step 4 — Kostenerstattung beantragen
+
+Terminal step. Available when steps 1 + 3 are erledigt, and step 2 is erledigt if visible.
+
+**UI:** Link to antrag checklist (unchanged, but checklist derives checks from data).
+
+## Status derivation
+
+Each step independently computes its status:
+
+| Query | SQL |
+|---|---|
+| hasErstgespraech | `SELECT EXISTS(SELECT 1 FROM sprechstunde)` |
+| hasDiagnose | `SELECT EXISTS(SELECT 1 FROM sprechstunde WHERE diagnose IS NOT NULL)` |
+| hasDringlichkeit | `SELECT EXISTS(SELECT 1 FROM sprechstunde WHERE dringlichkeitscode = TRUE)` |
+| tssKontaktiert | `nutzer.tss_kontaktiert_datum IS NOT NULL` |
+| absagenUndKeineAntwort | `SELECT COUNT(*) FROM kontakt WHERE ergebnis IN ('absage','keine_antwort')` |
+
+Step status mapping:
+- **erledigt:** prerequisite met (green badge)
+- **aktuell:** visible and not yet erledigt
+- **offen:** visible but upstream prerequisites not met
+- Step 2 not rendered at all when hasDringlichkeit = FALSE
+
+## Schema changes (migration 002)
+
+### Drop from `nutzer`
+
+`aktueller_schritt`, `dringlichkeitscode`, `dringlichkeitscode_datum`, `tss_beantragt`, `tss_beantragt_datum`
+
+### Add to `nutzer`
+
+`tss_kontaktiert_datum DATE` — nullable, presence = contacted
+
+### Modify `sprechstunde`
+
+- Drop `datum` (moves to sitzung)
+- Drop `ergebnis` (was always 'erstgespraech', unused)
+- Keep: `id`, `therapeut_id`, `diagnose` (text), `dringlichkeitscode` (boolean), `erstellt_am`, `aktualisiert_am`
+
+### New table `sitzung`
+
+```sql
+CREATE TABLE sitzung (
+  id SERIAL PRIMARY KEY,
+  sprechstunde_id INTEGER NOT NULL REFERENCES sprechstunde(id) ON DELETE CASCADE,
+  datum DATE NOT NULL,
+  erstellt_am TIMESTAMPTZ DEFAULT NOW()
+);
+```
+
+### Drop
+
+`prozessSchrittEnum` type and `ProzessSchritt` TypeScript type — no longer needed.
+
+## Files changed
+
+- **New:** `src/shared/db/migrations/002_process_model.sql` — schema migration
+- **Modify:** `src/shared/db/schema.ts` — remove `prozessSchrittEnum`/`ProzessSchritt`, add `Sitzung` type
+- **Modify:** `src/shared/lib/constants.ts` — remove `PROZESS_SCHRITTE` array
+- **Delete:** `src/shared/lib/constants.test.ts` — stale test for removed array
+- **New/Rewrite:** `src/features/prozess/hooks.ts` — `useProcessStatus()` hook deriving status from data
+- **Rewrite:** `src/features/prozess/components/process-stepper.tsx` — data-driven steps, Erstgespräch list/form, conditional TSS
+- **Modify:** `src/features/prozess/components/phase-card.tsx` — adapt to new status model if needed
+- **Modify:** `src/features/antrag/components/antrag-checklist.tsx` — derive checks from data instead of `nutzer` flags
+- **Modify:** `src/features/einstellungen/scenarios.ts` — seed data rows instead of setting `aktueller_schritt`
+- **Modify:** `src/features/onboarding/components/onboarding-form.tsx` — remove `aktueller_schritt` from INSERT