add now features

backend/src/database/migrations/014_create_atemschutz.sql

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+-- Migration: 014_create_atemschutz
+-- Atemschutz-Traegerverwaltung (Breathing Apparatus Carrier Management)
+-- Depends on: 001_create_users_table (users table, uuid-ossp, update_updated_at_column)
+--             003_create_mitglieder_profile (mitglieder_profile for the view)
+-- Rollback:
+--   DROP VIEW  IF EXISTS atemschutz_uebersicht;
+--   DROP TABLE IF EXISTS atemschutz_traeger;
+
+-- ============================================================
+-- TABLE: atemschutz_traeger (BA Carrier Registry)
+-- Each row = one firefighter qualified/tracked for BA use.
+-- One record per user (enforced by UNIQUE constraint).
+-- ============================================================
+CREATE TABLE IF NOT EXISTS atemschutz_traeger (
+    id                          UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    user_id                     UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+
+    -- Atemschutz-Lehrgang (BA course qualification)
+    atemschutz_lehrgang         BOOLEAN NOT NULL DEFAULT FALSE,
+    lehrgang_datum              DATE,
+
+    -- G26.3 Aerztliche Untersuchung (doctor's examination)
+    untersuchung_datum          DATE,
+    untersuchung_gueltig_bis    DATE,       -- typically valid 3 years
+    untersuchung_ergebnis       VARCHAR(30)
+        CHECK (untersuchung_ergebnis IS NULL OR untersuchung_ergebnis IN (
+            'tauglich', 'bedingt_tauglich', 'nicht_tauglich'
+        )),
+
+    -- Leistungstest / Finnentest (performance test)
+    leistungstest_datum         DATE,
+    leistungstest_gueltig_bis   DATE,       -- typically valid 1 year
+    leistungstest_bestanden     BOOLEAN,
+
+    -- Free-text notes (Kommandant / Atemschutzwart)
+    bemerkung                   TEXT,
+
+    -- Audit timestamps
+    created_at                  TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at                  TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+
+    -- One record per user
+    CONSTRAINT uq_atemschutz_user UNIQUE (user_id)
+);
+
+-- ============================================================
+-- Indexes for the most common query patterns
+-- ============================================================
+CREATE INDEX IF NOT EXISTS idx_atemschutz_user
+    ON atemschutz_traeger(user_id);
+
+CREATE INDEX IF NOT EXISTS idx_atemschutz_untersuchung
+    ON atemschutz_traeger(untersuchung_gueltig_bis)
+    WHERE untersuchung_gueltig_bis IS NOT NULL;
+
+CREATE INDEX IF NOT EXISTS idx_atemschutz_leistungstest
+    ON atemschutz_traeger(leistungstest_gueltig_bis)
+    WHERE leistungstest_gueltig_bis IS NOT NULL;
+
+-- ============================================================
+-- Auto-update trigger for updated_at
+-- Reuses the function already created by migration 001.
+-- ============================================================
+CREATE TRIGGER update_atemschutz_updated_at
+    BEFORE UPDATE ON atemschutz_traeger
+    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();
+
+-- ============================================================
+-- VIEW: atemschutz_uebersicht
+-- Dashboard view with user info and computed validity status.
+-- Joins user + mitglieder_profile for display name, rank, etc.
+-- Computes expiry flags so the frontend can render traffic-light
+-- indicators without any date math on the client side.
+-- ============================================================
+CREATE OR REPLACE VIEW atemschutz_uebersicht AS
+SELECT
+    at.*,
+    u.name              AS user_name,
+    u.given_name        AS user_given_name,
+    u.family_name       AS user_family_name,
+    u.email             AS user_email,
+    mp.status           AS mitglied_status,
+    mp.dienstgrad,
+
+    -- Computed: is the medical exam still valid?
+    CASE
+        WHEN at.untersuchung_gueltig_bis IS NOT NULL
+        THEN at.untersuchung_gueltig_bis >= CURRENT_DATE
+        ELSE FALSE
+    END AS untersuchung_gueltig,
+
+    -- Computed: days until medical exam expires (negative = expired)
+    CASE
+        WHEN at.untersuchung_gueltig_bis IS NOT NULL
+        THEN at.untersuchung_gueltig_bis::date - CURRENT_DATE
+        ELSE NULL
+    END AS untersuchung_tage_rest,
+
+    -- Computed: is the performance test still valid?
+    CASE
+        WHEN at.leistungstest_gueltig_bis IS NOT NULL
+        THEN at.leistungstest_gueltig_bis >= CURRENT_DATE
+        ELSE FALSE
+    END AS leistungstest_gueltig,
+
+    -- Computed: days until performance test expires (negative = expired)
+    CASE
+        WHEN at.leistungstest_gueltig_bis IS NOT NULL
+        THEN at.leistungstest_gueltig_bis::date - CURRENT_DATE
+        ELSE NULL
+    END AS leistungstest_tage_rest,
+
+    -- Computed: fully qualified for BA use (einsatzbereit)?
+    -- Requires: course done + valid medical (tauglich) + valid performance test (bestanden)
+    CASE
+        WHEN at.atemschutz_lehrgang = TRUE
+             AND at.untersuchung_gueltig_bis IS NOT NULL
+             AND at.untersuchung_gueltig_bis >= CURRENT_DATE
+             AND at.untersuchung_ergebnis = 'tauglich'
+             AND at.leistungstest_gueltig_bis IS NOT NULL
+             AND at.leistungstest_gueltig_bis >= CURRENT_DATE
+             AND at.leistungstest_bestanden = TRUE
+        THEN TRUE
+        ELSE FALSE
+    END AS einsatzbereit
+
+FROM atemschutz_traeger at
+JOIN users u ON u.id = at.user_id
+LEFT JOIN mitglieder_profile mp ON mp.user_id = at.user_id;