Merge branch 'feature/cfg-02-benachrichtigungs-dispatcher-core-service-fuer-module' into feature/ops-05-alerting-bei-schwellwert-ueberschreitung

# Conflicts:
#	scripts/reset-test-env.sh
#	scripts/run-checks.sh

migrations/0004_config_values.down.sql

@@ -0,0 +1,2 @@
+DROP TABLE IF EXISTS config_value_history;
+DROP TABLE IF EXISTS config_values;

migrations/0004_config_values.up.sql

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+-- Zentraler Konfigurationsdienst (CFG-01, siehe core-kanban/tickets/CFG-01.md).
+-- scope = 'global' fuer globale Defaults, sonst der Tenant-Slug. config_values
+-- haelt den AKTUELLEN Stand je (key, scope); config_value_history haelt JEDE
+-- Aenderung fest (Akzeptanzkriterium 2: versioniert nachvollziehbar).
+CREATE TABLE config_values (
+    key        TEXT NOT NULL,
+    scope      TEXT NOT NULL CHECK (scope <> ''),
+    value      TEXT NOT NULL,
+    version    INT NOT NULL,
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    PRIMARY KEY (key, scope)
+);
+
+CREATE TABLE config_value_history (
+    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    key        TEXT NOT NULL,
+    scope      TEXT NOT NULL,
+    value      TEXT NOT NULL,
+    version    INT NOT NULL,
+    changed_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX config_value_history_key_scope_idx ON config_value_history (key, scope, version);

migrations/0005_notification_jobs.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS notification_jobs;

migrations/0005_notification_jobs.up.sql

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+-- Benachrichtigungs-Dispatcher-Warteschlange (CFG-02, siehe
+-- core-kanban/tickets/CFG-02.md). Postgres-basiert statt Redis/AMQP
+-- (Projekt-Konvention, siehe nexarch-state.json techstack.job_queue) —
+-- Zeilen ueberleben einen Neustart des Dispatcher-Prozesses unveraendert
+-- (Akzeptanzkriterium 3).
+CREATE TABLE notification_jobs (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    channel         TEXT NOT NULL,
+    recipient       TEXT NOT NULL,
+    payload         JSONB NOT NULL DEFAULT '{}'::jsonb,
+    status          TEXT NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'sent', 'failed')),
+    attempts        INT NOT NULL DEFAULT 0,
+    max_attempts    INT NOT NULL DEFAULT 5,
+    next_attempt_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    last_error      TEXT,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX notification_jobs_due_idx ON notification_jobs (status, next_attempt_at);