test(repos): add SQL integration tests for 17 untested repo files

Add 148 integration tests exercising actual SQL against PostgreSQL for
all previously untested repository files. Includes 6 new fixture helpers
in testhelpers_db.go and CI PostgreSQL service configuration.

Discovered and documented existing RecordPurchase SQL bug (ambiguous
column reference in ON CONFLICT clause).

server/channelserver/repo_distribution_test.go

@@ -0,0 +1,146 @@
+package channelserver
+
+import (
+	"testing"
+
+	"github.com/jmoiron/sqlx"
+)
+
+func setupDistributionRepo(t *testing.T) (*DistributionRepository, *sqlx.DB, uint32) {
+	t.Helper()
+	db := SetupTestDB(t)
+	userID := CreateTestUser(t, db, "dist_test_user")
+	charID := CreateTestCharacter(t, db, userID, "DistChar")
+	repo := NewDistributionRepository(db)
+	t.Cleanup(func() { TeardownTestDB(t, db) })
+	return repo, db, charID
+}
+
+func createDistribution(t *testing.T, db *sqlx.DB, charID *uint32, distType int, eventName, description string) uint32 {
+	t.Helper()
+	var id uint32
+	err := db.QueryRow(
+		`INSERT INTO distribution (character_id, type, event_name, description, data, times_acceptable)
+		VALUES ($1, $2, $3, $4, $5, 1) RETURNING id`,
+		charID, distType, eventName, description, []byte{0x00},
+	).Scan(&id)
+	if err != nil {
+		t.Fatalf("Failed to create distribution: %v", err)
+	}
+	return id
+}
+
+func TestRepoDistributionListEmpty(t *testing.T) {
+	repo, _, charID := setupDistributionRepo(t)
+
+	dists, err := repo.List(charID, 1)
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+	if len(dists) != 0 {
+		t.Errorf("Expected 0 distributions, got: %d", len(dists))
+	}
+}
+
+func TestRepoDistributionListCharacterSpecific(t *testing.T) {
+	repo, db, charID := setupDistributionRepo(t)
+
+	createDistribution(t, db, &charID, 1, "Personal Gift", "For you")
+
+	dists, err := repo.List(charID, 1)
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+	if len(dists) != 1 {
+		t.Fatalf("Expected 1 distribution, got: %d", len(dists))
+	}
+	if dists[0].EventName != "Personal Gift" {
+		t.Errorf("Expected event_name='Personal Gift', got: %q", dists[0].EventName)
+	}
+}
+
+func TestRepoDistributionListGlobal(t *testing.T) {
+	repo, db, charID := setupDistributionRepo(t)
+
+	// Global distribution (character_id=NULL)
+	createDistribution(t, db, nil, 1, "Global Gift", "For everyone")
+
+	dists, err := repo.List(charID, 1)
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+	if len(dists) != 1 {
+		t.Fatalf("Expected 1 global distribution, got: %d", len(dists))
+	}
+}
+
+func TestRepoDistributionGetItems(t *testing.T) {
+	repo, db, charID := setupDistributionRepo(t)
+
+	distID := createDistribution(t, db, &charID, 1, "Item Gift", "Has items")
+	if _, err := db.Exec("INSERT INTO distribution_items (distribution_id, item_type, item_id, quantity) VALUES ($1, 1, 100, 5)", distID); err != nil {
+		t.Fatalf("Setup failed: %v", err)
+	}
+	if _, err := db.Exec("INSERT INTO distribution_items (distribution_id, item_type, item_id, quantity) VALUES ($1, 2, 200, 10)", distID); err != nil {
+		t.Fatalf("Setup failed: %v", err)
+	}
+
+	items, err := repo.GetItems(distID)
+	if err != nil {
+		t.Fatalf("GetItems failed: %v", err)
+	}
+	if len(items) != 2 {
+		t.Fatalf("Expected 2 items, got: %d", len(items))
+	}
+}
+
+func TestRepoDistributionRecordAccepted(t *testing.T) {
+	repo, db, charID := setupDistributionRepo(t)
+
+	distID := createDistribution(t, db, &charID, 1, "Accept Test", "Test")
+
+	if err := repo.RecordAccepted(distID, charID); err != nil {
+		t.Fatalf("RecordAccepted failed: %v", err)
+	}
+
+	// Verify accepted count in list
+	dists, err := repo.List(charID, 1)
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+	if len(dists) != 1 {
+		t.Fatalf("Expected 1 distribution, got: %d", len(dists))
+	}
+	if dists[0].TimesAccepted != 1 {
+		t.Errorf("Expected times_accepted=1, got: %d", dists[0].TimesAccepted)
+	}
+}
+
+func TestRepoDistributionGetDescription(t *testing.T) {
+	repo, db, charID := setupDistributionRepo(t)
+
+	distID := createDistribution(t, db, &charID, 1, "Desc Test", "~C05Special reward!")
+
+	desc, err := repo.GetDescription(distID)
+	if err != nil {
+		t.Fatalf("GetDescription failed: %v", err)
+	}
+	if desc != "~C05Special reward!" {
+		t.Errorf("Expected description='~C05Special reward!', got: %q", desc)
+	}
+}
+
+func TestRepoDistributionFiltersByType(t *testing.T) {
+	repo, db, charID := setupDistributionRepo(t)
+
+	createDistribution(t, db, &charID, 1, "Type 1", "Type 1")
+	createDistribution(t, db, &charID, 2, "Type 2", "Type 2")
+
+	dists, err := repo.List(charID, 1)
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+	if len(dists) != 1 {
+		t.Errorf("Expected 1 distribution of type 1, got: %d", len(dists))
+	}
+}