diff --git a/backend/src/cyclone/migrations/0005_line_reconciliation.sql b/backend/src/cyclone/migrations/0005_line_reconciliation.sql
new file mode 100644
index 0000000..687f8f7
--- /dev/null
+++ b/backend/src/cyclone/migrations/0005_line_reconciliation.sql
@@ -0,0 +1,42 @@
+-- version: 5
+-- SP7: per-service-line adjustment audit
+-- See spec: docs/superpowers/specs/2026-06-20-cyclone-line-reconciliation-design.md
+
+CREATE TABLE service_line_payments (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    remittance_id VARCHAR(64) NOT NULL REFERENCES remittances(id) ON DELETE CASCADE,
+    line_number INTEGER NOT NULL,
+    procedure_qualifier VARCHAR(4) NOT NULL,
+    procedure_code VARCHAR(16) NOT NULL,
+    modifiers_json TEXT NOT NULL DEFAULT '[]',
+    charge NUMERIC(12, 2) NOT NULL,
+    payment NUMERIC(12, 2) NOT NULL,
+    units NUMERIC(10, 2),
+    unit_type VARCHAR(8),
+    service_date DATE,
+    ref_benefit_plan VARCHAR(64),
+    superseded_by_id INTEGER REFERENCES service_line_payments(id) ON DELETE SET NULL
+);
+
+CREATE INDEX ix_service_line_payments_remittance_id ON service_line_payments(remittance_id);
+CREATE INDEX ix_service_line_payments_procedure_code_date ON service_line_payments(procedure_code, service_date);
+
+CREATE TABLE line_reconciliations (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    claim_id VARCHAR(64) NOT NULL REFERENCES claims(id) ON DELETE CASCADE,
+    claim_service_line_id INTEGER REFERENCES service_lines(id) ON DELETE SET NULL,
+    service_line_payment_id INTEGER REFERENCES service_line_payments(id) ON DELETE SET NULL,
+    status VARCHAR(16) NOT NULL,
+    match_score INTEGER,
+    reconciled_at TIMESTAMP NOT NULL
+);
+
+CREATE INDEX ix_line_reconciliations_claim_id ON line_reconciliations(claim_id);
+CREATE INDEX ix_line_reconciliations_claim_service_line_id ON line_reconciliations(claim_service_line_id);
+CREATE INDEX ix_line_reconciliations_service_line_payment_id ON line_reconciliations(service_line_payment_id);
+
+ALTER TABLE cas_adjustments ADD COLUMN service_line_payment_id INTEGER REFERENCES service_line_payments(id) ON DELETE SET NULL;
+
+ALTER TABLE remittances ADD COLUMN claim_level_adjustment_amount NUMERIC(12, 2) NOT NULL DEFAULT 0;
+
+CREATE INDEX ix_cas_adjustments_service_line_payment_id ON cas_adjustments(service_line_payment_id);