feat: project skeleton

- infra (k8s, kind, helm, docker) backbone is implemented
- security: implementation + unit tests are done

migrations/0003_notification_tables.sql

@@ -0,0 +1,25 @@
+-- Notification system tables
+-- Stores notification targets and delivery attempts
+
+CREATE TABLE notification_targets (
+    id UUID PRIMARY KEY,
+    org_id UUID NOT NULL REFERENCES orgs(id),
+    name TEXT NOT NULL,
+    target_type TEXT NOT NULL CHECK (target_type IN ('webhook', 'email', 'slack')),
+    webhook_url TEXT,
+    enabled BOOLEAN NOT NULL DEFAULT true,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_notification_targets_org ON notification_targets(org_id);
+
+CREATE TABLE notification_attempts (
+    id UUID PRIMARY KEY,
+    incident_id UUID NOT NULL REFERENCES incidents(id),
+    target_id UUID NOT NULL REFERENCES notification_targets(id),
+    status TEXT NOT NULL CHECK (status IN ('pending', 'sent', 'failed')),
+    error TEXT,
+    sent_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    UNIQUE (incident_id, target_id)
+);