diff --git a/db/migrations/001_invoice_guard.sql b/db/migrations/001_invoice_guard.sql
new file mode 100644
index 0000000..1b18757
--- /dev/null
+++ b/db/migrations/001_invoice_guard.sql
@@ -0,0 +1,37 @@
+CREATE TABLE IF NOT EXISTS invoice_cases (
+    id BIGSERIAL PRIMARY KEY,
+    tenant_key TEXT NOT NULL,
+    case_id TEXT NOT NULL,
+    invoice_count INTEGER NOT NULL DEFAULT 0,
+    duplicate_count INTEGER NOT NULL DEFAULT 0,
+    total_mismatch_count INTEGER NOT NULL DEFAULT 0,
+    invoices JSONB NOT NULL DEFAULT '[]'::jsonb,
+    duplicates JSONB NOT NULL DEFAULT '[]'::jsonb,
+    total_mismatches JSONB NOT NULL DEFAULT '[]'::jsonb,
+    decisions JSONB NOT NULL DEFAULT '[]'::jsonb,
+    receipt JSONB NOT NULL DEFAULT '{}'::jsonb,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (tenant_key, case_id)
+);
+
+CREATE INDEX IF NOT EXISTS invoice_cases_tenant_updated_idx
+    ON invoice_cases (tenant_key, updated_at DESC);
+
+CREATE INDEX IF NOT EXISTS invoice_cases_tenant_counts_idx
+    ON invoice_cases (tenant_key, duplicate_count, total_mismatch_count);
+
+CREATE TABLE IF NOT EXISTS invoice_execution_receipts (
+    id BIGSERIAL PRIMARY KEY,
+    tenant_key TEXT NOT NULL,
+    receipt_id TEXT NOT NULL,
+    case_id TEXT NOT NULL,
+    skill TEXT NOT NULL,
+    input_hash TEXT NOT NULL,
+    receipt JSONB NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (tenant_key, receipt_id)
+);
+
+CREATE INDEX IF NOT EXISTS invoice_receipts_case_idx
+    ON invoice_execution_receipts (tenant_key, case_id, created_at DESC);