diff --git a/internal/repository/postgres/health_check_test.go b/internal/repository/postgres/health_check_test.go
new file mode 100644
index 0000000..f9b132b
--- /dev/null
+++ b/internal/repository/postgres/health_check_test.go
@@ -0,0 +1,453 @@
+package postgres_test
+
+// Integration tests for HealthCheckRepository (M48). Closes the L-1
+// coverage gap flagged in coverage-gap-audit.md: the 453-line repository
+// shipped in M48 had zero live-DB tests, leaving 11 methods — including
+// the time-sensitive ListDueForCheck, PurgeHistory, and GetSummary —
+// without migration-pinned regression protection. These tests exercise
+// every method against a real Postgres 16 container through the same
+// schema-per-test harness used by repo_test.go.
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/shankar0123/certctl/internal/domain"
+	"github.com/shankar0123/certctl/internal/repository"
+	"github.com/shankar0123/certctl/internal/repository/postgres"
+)
+
+// newHealthCheck builds a minimal EndpointHealthCheck the repository will
+// accept. All time-pointer fields are left nil so callers can override
+// exactly the bits each subtest cares about — Create stores nil pointers
+// as NULL, which is what ListDueForCheck's `last_checked_at IS NULL`
+// branch relies on.
+func newHealthCheck(id, endpoint string, status domain.HealthStatus, enabled bool) *domain.EndpointHealthCheck {
+	now := time.Now().UTC().Truncate(time.Microsecond)
+	return &domain.EndpointHealthCheck{
+		ID:                id,
+		Endpoint:          endpoint,
+		Status:            status,
+		DegradedThreshold: 2,
+		DownThreshold:     5,
+		CheckIntervalSecs: 300,
+		Enabled:           enabled,
+		CreatedAt:         now,
+		UpdatedAt:         now,
+	}
+}
+
+// TestHealthCheckRepository_CRUD covers Create → Get → Update → Delete on
+// the nominal path. Also verifies the sql.NullTime round-trip: a check
+// created without timestamps comes back with nil pointers (not
+// zero-valued time.Time) so downstream Go code can distinguish "never
+// probed" from "probed at epoch".
+func TestHealthCheckRepository_CRUD(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewHealthCheckRepository(db)
+	ctx := context.Background()
+
+	check := newHealthCheck("hc-crud", "example.com:443", domain.HealthStatusHealthy, true)
+	check.ExpectedFingerprint = "sha256:expected"
+	check.ResponseTimeMs = 42
+
+	if err := repo.Create(ctx, check); err != nil {
+		t.Fatalf("Create failed: %v", err)
+	}
+
+	got, err := repo.Get(ctx, "hc-crud")
+	if err != nil {
+		t.Fatalf("Get failed: %v", err)
+	}
+	if got.Endpoint != "example.com:443" {
+		t.Errorf("Endpoint = %q, want example.com:443", got.Endpoint)
+	}
+	if got.Status != domain.HealthStatusHealthy {
+		t.Errorf("Status = %q, want %q", got.Status, domain.HealthStatusHealthy)
+	}
+	if got.ExpectedFingerprint != "sha256:expected" {
+		t.Errorf("ExpectedFingerprint = %q, want sha256:expected", got.ExpectedFingerprint)
+	}
+	if got.CheckIntervalSecs != 300 {
+		t.Errorf("CheckIntervalSecs = %d, want 300", got.CheckIntervalSecs)
+	}
+	if got.LastCheckedAt != nil {
+		t.Errorf("LastCheckedAt = %v, want nil (never probed)", got.LastCheckedAt)
+	}
+
+	// Update: status transition + observed fingerprint assignment.
+	// Update() rewrites UpdatedAt to time.Now() regardless of what we
+	// send, so record the pre-call timestamp to assert monotonic advance.
+	preUpdate := got.UpdatedAt
+	time.Sleep(2 * time.Millisecond) // ensure a measurable delta
+	got.Status = domain.HealthStatusDegraded
+	got.ObservedFingerprint = "sha256:observed"
+	got.ConsecutiveFailures = 2
+	if err := repo.Update(ctx, got); err != nil {
+		t.Fatalf("Update failed: %v", err)
+	}
+
+	got2, err := repo.Get(ctx, "hc-crud")
+	if err != nil {
+		t.Fatalf("Get after Update failed: %v", err)
+	}
+	if got2.Status != domain.HealthStatusDegraded {
+		t.Errorf("Status after Update = %q, want %q", got2.Status, domain.HealthStatusDegraded)
+	}
+	if got2.ObservedFingerprint != "sha256:observed" {
+		t.Errorf("ObservedFingerprint after Update = %q, want sha256:observed", got2.ObservedFingerprint)
+	}
+	if got2.ConsecutiveFailures != 2 {
+		t.Errorf("ConsecutiveFailures after Update = %d, want 2", got2.ConsecutiveFailures)
+	}
+	if !got2.UpdatedAt.After(preUpdate) {
+		t.Errorf("UpdatedAt did not advance: pre=%v post=%v", preUpdate, got2.UpdatedAt)
+	}
+
+	if err := repo.Delete(ctx, "hc-crud"); err != nil {
+		t.Fatalf("Delete failed: %v", err)
+	}
+	if _, err := repo.Get(ctx, "hc-crud"); err == nil {
+		t.Errorf("Get after Delete returned nil error, want not-found")
+	}
+}
+
+// TestHealthCheckRepository_GetByEndpoint verifies the secondary lookup
+// path used by AutoCreateFromDeployment to decide whether to INSERT or
+// UPDATE. Missing endpoints return an error (not a nil cert) so the
+// service layer can branch safely.
+func TestHealthCheckRepository_GetByEndpoint(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewHealthCheckRepository(db)
+	ctx := context.Background()
+
+	check := newHealthCheck("hc-byep", "svc.internal:443", domain.HealthStatusHealthy, true)
+	if err := repo.Create(ctx, check); err != nil {
+		t.Fatalf("Create failed: %v", err)
+	}
+
+	got, err := repo.GetByEndpoint(ctx, "svc.internal:443")
+	if err != nil {
+		t.Fatalf("GetByEndpoint failed: %v", err)
+	}
+	if got.ID != "hc-byep" {
+		t.Errorf("ID = %q, want hc-byep", got.ID)
+	}
+
+	if _, err := repo.GetByEndpoint(ctx, "never-seen.example.com:443"); err == nil {
+		t.Errorf("GetByEndpoint on unknown endpoint returned nil error")
+	}
+}
+
+// TestHealthCheckRepository_List_Filters seeds rows across the filter
+// axes (status, certificate_id, enabled) and asserts each branch of the
+// WHERE builder, plus the Page/PerPage pagination shim.
+func TestHealthCheckRepository_List_Filters(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewHealthCheckRepository(db)
+	ctx := context.Background()
+
+	// Create prereq managed certificate so certificate_id FK can be
+	// populated on one row — proves the filter path joins on a real ID.
+	ownerID, teamID, issuerID, policyID := insertCertPrereqsRaw(t, db, ctx, "hclist")
+	certID := "mc-hc-list"
+	now := time.Now().UTC().Truncate(time.Microsecond)
+	if _, err := db.ExecContext(ctx, `
+		INSERT INTO managed_certificates (id, name, common_name, sans, environment, owner_id, team_id, issuer_id, renewal_policy_id, status, expires_at, tags, created_at, updated_at)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14)`,
+		certID, "hc-list-cert", "hc.example.com", "{}", "production",
+		ownerID, teamID, issuerID, policyID,
+		string(domain.CertificateStatusActive), now.Add(90*24*time.Hour), "{}",
+		now, now); err != nil {
+		t.Fatalf("seed managed_certificate: %v", err)
+	}
+
+	// 4 rows: healthy+enabled+cert, degraded+enabled, down+disabled, unknown+enabled.
+	rows := []*domain.EndpointHealthCheck{
+		newHealthCheck("hc-list-1", "a.example.com:443", domain.HealthStatusHealthy, true),
+		newHealthCheck("hc-list-2", "b.example.com:443", domain.HealthStatusDegraded, true),
+		newHealthCheck("hc-list-3", "c.example.com:443", domain.HealthStatusDown, false),
+		newHealthCheck("hc-list-4", "d.example.com:443", domain.HealthStatusUnknown, true),
+	}
+	rows[0].CertificateID = &certID
+	for _, r := range rows {
+		if err := repo.Create(ctx, r); err != nil {
+			t.Fatalf("Create %s: %v", r.ID, err)
+		}
+	}
+
+	// Filter: status=healthy → 1 result.
+	got, total, err := repo.List(ctx, &repository.HealthCheckFilter{Status: string(domain.HealthStatusHealthy)})
+	if err != nil {
+		t.Fatalf("List status=healthy: %v", err)
+	}
+	if total != 1 || len(got) != 1 || got[0].ID != "hc-list-1" {
+		t.Errorf("status=healthy: total=%d rows=%d want 1/1 with hc-list-1", total, len(got))
+	}
+
+	// Filter: certificate_id → 1 result.
+	got, total, err = repo.List(ctx, &repository.HealthCheckFilter{CertificateID: certID})
+	if err != nil {
+		t.Fatalf("List certificate_id: %v", err)
+	}
+	if total != 1 || len(got) != 1 || got[0].ID != "hc-list-1" {
+		t.Errorf("certificate_id filter: total=%d rows=%d want 1/1", total, len(got))
+	}
+
+	// Filter: enabled=false → 1 result.
+	disabled := false
+	got, total, err = repo.List(ctx, &repository.HealthCheckFilter{Enabled: &disabled})
+	if err != nil {
+		t.Fatalf("List enabled=false: %v", err)
+	}
+	if total != 1 || len(got) != 1 || got[0].ID != "hc-list-3" {
+		t.Errorf("enabled=false: total=%d rows=%d want 1/1 with hc-list-3", total, len(got))
+	}
+
+	// Pagination: per_page=2 → first page has 2, total reflects all 4.
+	got, total, err = repo.List(ctx, &repository.HealthCheckFilter{Page: 1, PerPage: 2})
+	if err != nil {
+		t.Fatalf("List paginated: %v", err)
+	}
+	if total != 4 {
+		t.Errorf("paginated total = %d, want 4", total)
+	}
+	if len(got) != 2 {
+		t.Errorf("paginated rows = %d, want 2", len(got))
+	}
+}
+
+// TestHealthCheckRepository_ListDueForCheck seeds all four branches of
+// the WHERE clause — (a) enabled+null → due, (b) enabled+past-due → due,
+// (c) enabled+recent → not due, (d) disabled+null → excluded — and
+// asserts the ORDER BY last_checked_at NULLS FIRST, ASC ordering.
+//
+// This is the hot path the scheduler's 8th loop hits every 60 seconds;
+// a correctness regression here silently fails every probe.
+func TestHealthCheckRepository_ListDueForCheck(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewHealthCheckRepository(db)
+	ctx := context.Background()
+
+	now := time.Now().UTC().Truncate(time.Microsecond)
+	pastDue := now.Add(-10 * time.Minute)   // > 300s ago, enabled → due
+	recent := now.Add(-30 * time.Second)    // < 300s ago, enabled → not due
+
+	// (a) enabled + null last_checked_at — NULLS FIRST puts this first
+	a := newHealthCheck("hc-due-a", "a.example.com:443", domain.HealthStatusUnknown, true)
+	// (b) enabled + past-due last_checked_at
+	b := newHealthCheck("hc-due-b", "b.example.com:443", domain.HealthStatusHealthy, true)
+	b.LastCheckedAt = &pastDue
+	// (c) enabled + recent last_checked_at — must NOT appear
+	c := newHealthCheck("hc-due-c", "c.example.com:443", domain.HealthStatusHealthy, true)
+	c.LastCheckedAt = &recent
+	// (d) disabled + null last_checked_at — must NOT appear
+	d := newHealthCheck("hc-due-d", "d.example.com:443", domain.HealthStatusUnknown, false)
+
+	for _, r := range []*domain.EndpointHealthCheck{a, b, c, d} {
+		if err := repo.Create(ctx, r); err != nil {
+			t.Fatalf("Create %s: %v", r.ID, err)
+		}
+	}
+
+	due, err := repo.ListDueForCheck(ctx)
+	if err != nil {
+		t.Fatalf("ListDueForCheck: %v", err)
+	}
+	if len(due) != 2 {
+		ids := make([]string, 0, len(due))
+		for _, r := range due {
+			ids = append(ids, r.ID)
+		}
+		t.Fatalf("due rows = %d (%v), want exactly 2 (hc-due-a, hc-due-b)", len(due), ids)
+	}
+	// NULLS FIRST: variant (a) should precede variant (b).
+	if due[0].ID != "hc-due-a" {
+		t.Errorf("due[0].ID = %q, want hc-due-a (NULLS FIRST)", due[0].ID)
+	}
+	if due[1].ID != "hc-due-b" {
+		t.Errorf("due[1].ID = %q, want hc-due-b", due[1].ID)
+	}
+	// Sanity: neither excluded row leaked through.
+	for _, r := range due {
+		if r.ID == "hc-due-c" {
+			t.Errorf("recent-probed row hc-due-c leaked into due set")
+		}
+		if r.ID == "hc-due-d" {
+			t.Errorf("disabled row hc-due-d leaked into due set")
+		}
+	}
+}
+
+// TestHealthCheckRepository_RecordHistory_GetHistory asserts FIFO
+// insertion with DESC retrieval (most-recent-first) and the explicit
+// limit clamp.
+func TestHealthCheckRepository_RecordHistory_GetHistory(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewHealthCheckRepository(db)
+	ctx := context.Background()
+
+	parent := newHealthCheck("hc-hist", "hist.example.com:443", domain.HealthStatusHealthy, true)
+	if err := repo.Create(ctx, parent); err != nil {
+		t.Fatalf("Create parent: %v", err)
+	}
+
+	base := time.Now().UTC().Truncate(time.Microsecond)
+	entries := []*domain.HealthHistoryEntry{
+		{ID: "hh-1", HealthCheckID: "hc-hist", Status: string(domain.HealthStatusHealthy), ResponseTimeMs: 10, CheckedAt: base.Add(-3 * time.Minute)},
+		{ID: "hh-2", HealthCheckID: "hc-hist", Status: string(domain.HealthStatusDegraded), ResponseTimeMs: 20, CheckedAt: base.Add(-2 * time.Minute)},
+		{ID: "hh-3", HealthCheckID: "hc-hist", Status: string(domain.HealthStatusHealthy), ResponseTimeMs: 30, CheckedAt: base.Add(-1 * time.Minute)},
+	}
+	for _, e := range entries {
+		if err := repo.RecordHistory(ctx, e); err != nil {
+			t.Fatalf("RecordHistory %s: %v", e.ID, err)
+		}
+	}
+
+	// limit=2 → newest 2 in DESC order: hh-3, hh-2.
+	got, err := repo.GetHistory(ctx, "hc-hist", 2)
+	if err != nil {
+		t.Fatalf("GetHistory: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("rows = %d, want 2", len(got))
+	}
+	if got[0].ID != "hh-3" || got[1].ID != "hh-2" {
+		t.Errorf("order = [%s, %s], want [hh-3, hh-2]", got[0].ID, got[1].ID)
+	}
+
+	// limit=0 → default 100 → returns all 3.
+	got, err = repo.GetHistory(ctx, "hc-hist", 0)
+	if err != nil {
+		t.Fatalf("GetHistory limit=0: %v", err)
+	}
+	if len(got) != 3 {
+		t.Errorf("limit=0 rows = %d, want 3", len(got))
+	}
+}
+
+// TestHealthCheckRepository_PurgeHistory exercises the retention-sweep
+// hot path (scheduler calls this once/day). 5 past + 5 future straddling
+// the cutoff exposes both sides of the < comparator — an off-by-one
+// regression here would either nuke live data or skip rows the retention
+// policy was meant to remove.
+func TestHealthCheckRepository_PurgeHistory(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewHealthCheckRepository(db)
+	ctx := context.Background()
+
+	parent := newHealthCheck("hc-purge", "purge.example.com:443", domain.HealthStatusHealthy, true)
+	if err := repo.Create(ctx, parent); err != nil {
+		t.Fatalf("Create parent: %v", err)
+	}
+
+	cutoff := time.Now().UTC().Truncate(time.Microsecond)
+
+	// 5 rows BEFORE cutoff (should be purged).
+	for i := 0; i < 5; i++ {
+		e := &domain.HealthHistoryEntry{
+			ID:            "hh-past-" + string(rune('0'+i)),
+			HealthCheckID: "hc-purge",
+			Status:        string(domain.HealthStatusHealthy),
+			CheckedAt:     cutoff.Add(time.Duration(-10-i) * time.Minute),
+		}
+		if err := repo.RecordHistory(ctx, e); err != nil {
+			t.Fatalf("RecordHistory past %d: %v", i, err)
+		}
+	}
+	// 5 rows AFTER cutoff (should remain).
+	for i := 0; i < 5; i++ {
+		e := &domain.HealthHistoryEntry{
+			ID:            "hh-future-" + string(rune('0'+i)),
+			HealthCheckID: "hc-purge",
+			Status:        string(domain.HealthStatusHealthy),
+			CheckedAt:     cutoff.Add(time.Duration(1+i) * time.Minute),
+		}
+		if err := repo.RecordHistory(ctx, e); err != nil {
+			t.Fatalf("RecordHistory future %d: %v", i, err)
+		}
+	}
+
+	deleted, err := repo.PurgeHistory(ctx, cutoff)
+	if err != nil {
+		t.Fatalf("PurgeHistory: %v", err)
+	}
+	if deleted != 5 {
+		t.Errorf("deleted = %d, want 5", deleted)
+	}
+
+	remaining, err := repo.GetHistory(ctx, "hc-purge", 100)
+	if err != nil {
+		t.Fatalf("GetHistory after purge: %v", err)
+	}
+	if len(remaining) != 5 {
+		t.Errorf("remaining = %d, want 5", len(remaining))
+	}
+}
+
+// TestHealthCheckRepository_GetSummary seeds all 5 HealthStatus values
+// in a non-uniform distribution so the GROUP BY status branch-table gets
+// exercised on each arm. The Total field is computed inside the
+// aggregator — its drift would not surface unless we assert it too.
+func TestHealthCheckRepository_GetSummary(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewHealthCheckRepository(db)
+	ctx := context.Background()
+
+	seed := map[domain.HealthStatus]int{
+		domain.HealthStatusHealthy:      3,
+		domain.HealthStatusDegraded:     2,
+		domain.HealthStatusDown:         2,
+		domain.HealthStatusCertMismatch: 1,
+		domain.HealthStatusUnknown:      1,
+	}
+	idx := 0
+	for status, count := range seed {
+		for i := 0; i < count; i++ {
+			check := newHealthCheck(
+				"hc-sum-"+string(rune('a'+idx)),
+				"sum.example.com:443",
+				status,
+				true,
+			)
+			// Endpoint uniqueness isn't enforced by the schema but making
+			// it unique documents intent and rules out false-positives.
+			check.Endpoint = check.ID + "-" + check.Endpoint
+			if err := repo.Create(ctx, check); err != nil {
+				t.Fatalf("Create %s: %v", check.ID, err)
+			}
+			idx++
+		}
+	}
+
+	summary, err := repo.GetSummary(ctx)
+	if err != nil {
+		t.Fatalf("GetSummary: %v", err)
+	}
+	if summary.Healthy != 3 {
+		t.Errorf("Healthy = %d, want 3", summary.Healthy)
+	}
+	if summary.Degraded != 2 {
+		t.Errorf("Degraded = %d, want 2", summary.Degraded)
+	}
+	if summary.Down != 2 {
+		t.Errorf("Down = %d, want 2", summary.Down)
+	}
+	if summary.CertMismatch != 1 {
+		t.Errorf("CertMismatch = %d, want 1", summary.CertMismatch)
+	}
+	if summary.Unknown != 1 {
+		t.Errorf("Unknown = %d, want 1", summary.Unknown)
+	}
+	if summary.Total != 9 {
+		t.Errorf("Total = %d, want 9 (3+2+2+1+1)", summary.Total)
+	}
+}
diff --git a/internal/repository/postgres/renewal_policy_test.go b/internal/repository/postgres/renewal_policy_test.go
new file mode 100644
index 0000000..eda633f
--- /dev/null
+++ b/internal/repository/postgres/renewal_policy_test.go
@@ -0,0 +1,317 @@
+package postgres_test
+
+// Integration tests for RenewalPolicyRepository (post-G-1, 289 lines, 5
+// methods). Closes the L-1 coverage gap flagged in coverage-gap-audit.md:
+// the repository's auto-generated-ID collision retry loop and its two
+// typed error sentinels (ErrRenewalPolicyDuplicateName on pg 23505,
+// ErrRenewalPolicyInUse on pg 23503) shipped with zero live-DB regression
+// coverage — a mock-only test surface cannot exercise the PostgreSQL
+// constraint semantics these paths depend on.
+//
+// The audit listed the file as "92 lines, 2 methods"; that was stale
+// pre-G-1. Current state is 5 methods (Get/List/Create/Update/Delete),
+// all covered below.
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/shankar0123/certctl/internal/domain"
+	"github.com/shankar0123/certctl/internal/repository"
+	"github.com/shankar0123/certctl/internal/repository/postgres"
+)
+
+// TestRenewalPolicyRepository_CRUD exercises the happy path for all five
+// interface methods. In particular it drives the slug-based ID
+// auto-generation branch (policy.ID left empty → Create emits
+// rp-<slug(name)>) so any regression to slugifyPolicyName or the retry
+// loop surfaces immediately. The AlertThresholdsDays JSONB round-trip is
+// asserted end-to-end: marshal on Create → store as JSONB → scan back on
+// Get preserves the slice ordering and values.
+func TestRenewalPolicyRepository_CRUD(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewRenewalPolicyRepository(db)
+	ctx := context.Background()
+
+	// Create: leave ID empty so the repository generates rp-<slug(name)>.
+	// "Prod TLS 90d" → rp-prod-tls-90d per slugifyPolicyName's rules
+	// (lowercase, spaces→hyphens, non-alphanumeric stripped).
+	policy := &domain.RenewalPolicy{
+		Name:                "Prod TLS 90d",
+		RenewalWindowDays:   30,
+		AutoRenew:           true,
+		MaxRetries:          5,
+		RetryInterval:       3600, // stored in retry_interval_minutes column; passthrough
+		AlertThresholdsDays: []int{30, 14, 7, 0},
+	}
+
+	if err := repo.Create(ctx, policy); err != nil {
+		t.Fatalf("Create failed: %v", err)
+	}
+	if policy.ID != "rp-prod-tls-90d" {
+		t.Errorf("auto-generated ID = %q, want %q", policy.ID, "rp-prod-tls-90d")
+	}
+	if policy.CreatedAt.IsZero() {
+		t.Error("Create did not populate CreatedAt (RETURNING clause regression?)")
+	}
+	if policy.UpdatedAt.IsZero() {
+		t.Error("Create did not populate UpdatedAt (RETURNING clause regression?)")
+	}
+
+	// Get: pull the just-created row back and confirm every stored field
+	// survives the scanRenewalPolicy path, including the JSONB unmarshal.
+	got, err := repo.Get(ctx, policy.ID)
+	if err != nil {
+		t.Fatalf("Get failed: %v", err)
+	}
+	if got.Name != "Prod TLS 90d" {
+		t.Errorf("Get: Name = %q, want %q", got.Name, "Prod TLS 90d")
+	}
+	if got.RenewalWindowDays != 30 {
+		t.Errorf("Get: RenewalWindowDays = %d, want 30", got.RenewalWindowDays)
+	}
+	if !got.AutoRenew {
+		t.Error("Get: AutoRenew = false, want true")
+	}
+	if got.MaxRetries != 5 {
+		t.Errorf("Get: MaxRetries = %d, want 5", got.MaxRetries)
+	}
+	if len(got.AlertThresholdsDays) != 4 {
+		t.Fatalf("Get: AlertThresholdsDays length = %d, want 4 (JSONB round-trip regression)", len(got.AlertThresholdsDays))
+	}
+	for i, want := range []int{30, 14, 7, 0} {
+		if got.AlertThresholdsDays[i] != want {
+			t.Errorf("Get: AlertThresholdsDays[%d] = %d, want %d", i, got.AlertThresholdsDays[i], want)
+		}
+	}
+
+	// Update: 3-arg signature is a house invariant — don't let it slip to
+	// 2-arg without the test catching the breakage. Tweak scalar + JSONB
+	// simultaneously so both SET branches exercise.
+	updated := *got
+	updated.Name = "Prod TLS 90d (tightened)"
+	updated.RenewalWindowDays = 45
+	updated.AlertThresholdsDays = []int{45, 30, 14, 7, 0}
+
+	// Sleep long enough that NOW() ticks past the Create timestamp so we
+	// can assert UpdatedAt monotonicity without a flaky equality check.
+	time.Sleep(2 * time.Millisecond)
+
+	if err := repo.Update(ctx, policy.ID, &updated); err != nil {
+		t.Fatalf("Update failed: %v", err)
+	}
+	if !updated.UpdatedAt.After(got.UpdatedAt) {
+		t.Errorf("Update: UpdatedAt %v not after Create's %v (RETURNING NOW() regression?)", updated.UpdatedAt, got.UpdatedAt)
+	}
+
+	refetched, err := repo.Get(ctx, policy.ID)
+	if err != nil {
+		t.Fatalf("Get after Update failed: %v", err)
+	}
+	if refetched.Name != "Prod TLS 90d (tightened)" {
+		t.Errorf("Get after Update: Name = %q, want %q", refetched.Name, "Prod TLS 90d (tightened)")
+	}
+	if refetched.RenewalWindowDays != 45 {
+		t.Errorf("Get after Update: RenewalWindowDays = %d, want 45", refetched.RenewalWindowDays)
+	}
+	if len(refetched.AlertThresholdsDays) != 5 {
+		t.Errorf("Get after Update: AlertThresholdsDays length = %d, want 5", len(refetched.AlertThresholdsDays))
+	}
+
+	// List: add a second policy so the ORDER BY name contract is non-vacuous.
+	second := &domain.RenewalPolicy{
+		Name:                "Aa Earliest",
+		RenewalWindowDays:   14,
+		AutoRenew:           false,
+		MaxRetries:          1,
+		RetryInterval:       60,
+		AlertThresholdsDays: []int{7, 0},
+	}
+	if err := repo.Create(ctx, second); err != nil {
+		t.Fatalf("Create second failed: %v", err)
+	}
+
+	all, err := repo.List(ctx)
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+	if len(all) != 2 {
+		t.Fatalf("List: len = %d, want 2", len(all))
+	}
+	// "Aa Earliest" sorts before "Prod TLS 90d (tightened)" under ORDER BY name ASC.
+	if all[0].Name != "Aa Earliest" {
+		t.Errorf("List[0].Name = %q, want %q (ORDER BY name regression?)", all[0].Name, "Aa Earliest")
+	}
+
+	// Delete: removes the policy and a follow-up Get surfaces "not found".
+	if err := repo.Delete(ctx, policy.ID); err != nil {
+		t.Fatalf("Delete failed: %v", err)
+	}
+	if _, err := repo.Get(ctx, policy.ID); err == nil {
+		t.Error("Get after Delete: err = nil, want not-found")
+	}
+}
+
+// TestRenewalPolicyRepository_DuplicateName verifies the pg 23505
+// unique_violation translation. The name UNIQUE constraint is enforced
+// on the renewal_policies.name column; Create's inner scanRenewalPolicy
+// must see the pq.Error, call isUniqueViolation, check the constraint
+// name, and return ErrRenewalPolicyDuplicateName. A non-sentinel error
+// here would cause the handler to emit 500 instead of 409.
+func TestRenewalPolicyRepository_DuplicateName(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewRenewalPolicyRepository(db)
+	ctx := context.Background()
+
+	first := &domain.RenewalPolicy{
+		ID:                  "rp-first",
+		Name:                "Shared Name",
+		RenewalWindowDays:   30,
+		AutoRenew:           true,
+		MaxRetries:          3,
+		RetryInterval:       300,
+		AlertThresholdsDays: domain.DefaultAlertThresholds(),
+	}
+	if err := repo.Create(ctx, first); err != nil {
+		t.Fatalf("Create first failed: %v", err)
+	}
+
+	// Second policy with a distinct ID but the same Name — the name UNIQUE
+	// constraint fires, Create's collision branch inspects pqErr.Constraint,
+	// and because it's NOT *_pkey, it returns ErrRenewalPolicyDuplicateName
+	// without retrying.
+	second := &domain.RenewalPolicy{
+		ID:                  "rp-second",
+		Name:                "Shared Name",
+		RenewalWindowDays:   60,
+		AutoRenew:           false,
+		MaxRetries:          1,
+		RetryInterval:       600,
+		AlertThresholdsDays: domain.DefaultAlertThresholds(),
+	}
+	err := repo.Create(ctx, second)
+	if err == nil {
+		t.Fatal("Create second: err = nil, want ErrRenewalPolicyDuplicateName")
+	}
+	if !errors.Is(err, repository.ErrRenewalPolicyDuplicateName) {
+		t.Errorf("Create second: err = %v, want ErrRenewalPolicyDuplicateName (via errors.Is)", err)
+	}
+
+	// Also verify Update surfaces the same sentinel when an existing row's
+	// name is changed to collide with another policy's name.
+	third := &domain.RenewalPolicy{
+		ID:                  "rp-third",
+		Name:                "Third Name",
+		RenewalWindowDays:   90,
+		AutoRenew:           true,
+		MaxRetries:          2,
+		RetryInterval:       1200,
+		AlertThresholdsDays: domain.DefaultAlertThresholds(),
+	}
+	if err := repo.Create(ctx, third); err != nil {
+		t.Fatalf("Create third failed: %v", err)
+	}
+	third.Name = "Shared Name" // collide with first
+	err = repo.Update(ctx, third.ID, third)
+	if err == nil {
+		t.Fatal("Update: err = nil, want ErrRenewalPolicyDuplicateName")
+	}
+	if !errors.Is(err, repository.ErrRenewalPolicyDuplicateName) {
+		t.Errorf("Update: err = %v, want ErrRenewalPolicyDuplicateName (via errors.Is)", err)
+	}
+}
+
+// TestRenewalPolicyRepository_DeleteInUse verifies the pg 23503
+// foreign_key_violation translation. managed_certificates.renewal_policy_id
+// REFERENCES renewal_policies(id) ON DELETE RESTRICT; attempting to Delete
+// a policy while a certificate still references it must surface as
+// ErrRenewalPolicyInUse so the handler can emit 409 Conflict. Any change
+// to either the FK definition or the isForeignKeyViolation mapping breaks
+// this.
+func TestRenewalPolicyRepository_DeleteInUse(t *testing.T) {
+	tdb := getTestDB(t)
+	db := tdb.freshSchema(t)
+	repo := postgres.NewRenewalPolicyRepository(db)
+	ctx := context.Background()
+
+	// The policy under test — create via repo so ID auto-generation is
+	// also exercised end-to-end in this path.
+	policy := &domain.RenewalPolicy{
+		Name:                "InUse Policy",
+		RenewalWindowDays:   30,
+		AutoRenew:           true,
+		MaxRetries:          3,
+		RetryInterval:       300,
+		AlertThresholdsDays: domain.DefaultAlertThresholds(),
+	}
+	if err := repo.Create(ctx, policy); err != nil {
+		t.Fatalf("Create policy failed: %v", err)
+	}
+
+	// Create owner/team/issuer prerequisites, then raw-INSERT a
+	// managed_certificate row referencing the policy. Using raw SQL here
+	// (matching insertCertPrereqsRaw's idiom) keeps the test independent
+	// of the service layer.
+	ownerID, teamID, issuerID, _ := insertCertPrereqsRaw(t, db, ctx, "inuse")
+
+	now := time.Now().UTC().Truncate(time.Microsecond)
+	_, err := db.ExecContext(ctx, `
+		INSERT INTO managed_certificates (
+			id, name, common_name, sans, environment,
+			owner_id, team_id, issuer_id, renewal_policy_id,
+			status, expires_at, tags, created_at, updated_at
+		) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14)
+	`,
+		"mc-inuse", "inuse-cert", "inuse.example.com", []string{}, "production",
+		ownerID, teamID, issuerID, policy.ID,
+		string(domain.CertificateStatusActive), now.Add(90*24*time.Hour), "{}", now, now,
+	)
+	if err != nil {
+		t.Fatalf("INSERT managed_certificates failed: %v", err)
+	}
+
+	// Delete: the ON DELETE RESTRICT FK fires, the pg driver returns a
+	// *pq.Error with Code 23503, isForeignKeyViolation detects it, and
+	// the repository returns ErrRenewalPolicyInUse.
+	err = repo.Delete(ctx, policy.ID)
+	if err == nil {
+		t.Fatal("Delete: err = nil, want ErrRenewalPolicyInUse (ON DELETE RESTRICT should have fired)")
+	}
+	if !errors.Is(err, repository.ErrRenewalPolicyInUse) {
+		t.Errorf("Delete: err = %v, want ErrRenewalPolicyInUse (via errors.Is)", err)
+	}
+
+	// And the policy is still there — RESTRICT aborted the delete.
+	if _, err := repo.Get(ctx, policy.ID); err != nil {
+		t.Errorf("Get after failed Delete: err = %v, want nil (policy should still exist)", err)
+	}
+
+	// After removing the referencing cert, Delete succeeds — proves the
+	// RESTRICT was the only thing blocking the earlier Delete and rules
+	// out any unrelated failure mode.
+	if _, err := db.ExecContext(ctx, `DELETE FROM managed_certificates WHERE id = $1`, "mc-inuse"); err != nil {
+		t.Fatalf("cleanup DELETE managed_certificates failed: %v", err)
+	}
+	if err := repo.Delete(ctx, policy.ID); err != nil {
+		t.Errorf("Delete after cleanup: err = %v, want nil", err)
+	}
+
+	// Also verify Delete on a non-existent ID returns a not-found error
+	// (not nil, not the InUse sentinel) — guards against a silent no-op
+	// regression in the RowsAffected check.
+	err = repo.Delete(ctx, "rp-does-not-exist")
+	if err == nil {
+		t.Fatal("Delete(non-existent): err = nil, want not-found")
+	}
+	if errors.Is(err, repository.ErrRenewalPolicyInUse) {
+		t.Errorf("Delete(non-existent): err = %v, should not be ErrRenewalPolicyInUse", err)
+	}
+	if !strings.Contains(err.Error(), "not found") {
+		t.Errorf("Delete(non-existent): err = %v, want substring %q", err, "not found")
+	}
+}
diff --git a/internal/repository/postgres/repo_test.go b/internal/repository/postgres/repo_test.go
index 7e07fe1..dc38d74 100644
--- a/internal/repository/postgres/repo_test.go
+++ b/internal/repository/postgres/repo_test.go
@@ -1,6 +1,8 @@
-// Package postgres_test provides repository integration tests covering 15 of 17
+// Package postgres_test provides repository integration tests covering 17 of 17
 // PostgreSQL repository files. Each test function exercises CRUD operations,
-// edge cases, and deduplication logic against a real database.
+// edge cases, and deduplication logic against a real database. HealthCheck
+// and RenewalPolicy integration tests live in sibling *_test.go files in this
+// package (see health_check_test.go and renewal_policy_test.go).
 package postgres_test
 
 import (