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_mercenary_test.go

@@ -0,0 +1,161 @@
+package channelserver
+
+import (
+	"testing"
+
+	"github.com/jmoiron/sqlx"
+)
+
+func setupMercenaryRepo(t *testing.T) (*MercenaryRepository, *sqlx.DB, uint32, uint32) {
+	t.Helper()
+	db := SetupTestDB(t)
+	userID := CreateTestUser(t, db, "merc_test_user")
+	charID := CreateTestCharacter(t, db, userID, "MercChar")
+	guildID := CreateTestGuild(t, db, charID, "MercGuild")
+	repo := NewMercenaryRepository(db)
+	t.Cleanup(func() { TeardownTestDB(t, db) })
+	return repo, db, charID, guildID
+}
+
+func TestRepoMercenaryNextRastaID(t *testing.T) {
+	repo, _, _, _ := setupMercenaryRepo(t)
+
+	id1, err := repo.NextRastaID()
+	if err != nil {
+		t.Fatalf("NextRastaID failed: %v", err)
+	}
+	id2, err := repo.NextRastaID()
+	if err != nil {
+		t.Fatalf("NextRastaID second call failed: %v", err)
+	}
+	if id2 <= id1 {
+		t.Errorf("Expected increasing IDs, got: %d then %d", id1, id2)
+	}
+}
+
+func TestRepoMercenaryNextAirouID(t *testing.T) {
+	repo, _, _, _ := setupMercenaryRepo(t)
+
+	id1, err := repo.NextAirouID()
+	if err != nil {
+		t.Fatalf("NextAirouID failed: %v", err)
+	}
+	id2, err := repo.NextAirouID()
+	if err != nil {
+		t.Fatalf("NextAirouID second call failed: %v", err)
+	}
+	if id2 <= id1 {
+		t.Errorf("Expected increasing IDs, got: %d then %d", id1, id2)
+	}
+}
+
+func TestRepoMercenaryGetMercenaryLoansEmpty(t *testing.T) {
+	repo, _, charID, _ := setupMercenaryRepo(t)
+
+	loans, err := repo.GetMercenaryLoans(charID)
+	if err != nil {
+		t.Fatalf("GetMercenaryLoans failed: %v", err)
+	}
+	if len(loans) != 0 {
+		t.Errorf("Expected 0 loans, got: %d", len(loans))
+	}
+}
+
+func TestRepoMercenaryGetMercenaryLoans(t *testing.T) {
+	repo, db, charID, _ := setupMercenaryRepo(t)
+
+	// Set rasta_id on charID
+	if _, err := db.Exec("UPDATE characters SET rasta_id=999 WHERE id=$1", charID); err != nil {
+		t.Fatalf("Setup rasta_id failed: %v", err)
+	}
+
+	// Create another character that has a pact with charID's rasta
+	user2 := CreateTestUser(t, db, "merc_user2")
+	char2 := CreateTestCharacter(t, db, user2, "PactHolder")
+	if _, err := db.Exec("UPDATE characters SET pact_id=999 WHERE id=$1", char2); err != nil {
+		t.Fatalf("Setup pact_id failed: %v", err)
+	}
+
+	loans, err := repo.GetMercenaryLoans(charID)
+	if err != nil {
+		t.Fatalf("GetMercenaryLoans failed: %v", err)
+	}
+	if len(loans) != 1 {
+		t.Fatalf("Expected 1 loan, got: %d", len(loans))
+	}
+	if loans[0].Name != "PactHolder" {
+		t.Errorf("Expected name='PactHolder', got: %q", loans[0].Name)
+	}
+	if loans[0].CharID != char2 {
+		t.Errorf("Expected charID=%d, got: %d", char2, loans[0].CharID)
+	}
+}
+
+func TestRepoMercenaryGetGuildHuntCatsUsedEmpty(t *testing.T) {
+	repo, _, charID, _ := setupMercenaryRepo(t)
+
+	cats, err := repo.GetGuildHuntCatsUsed(charID)
+	if err != nil {
+		t.Fatalf("GetGuildHuntCatsUsed failed: %v", err)
+	}
+	if len(cats) != 0 {
+		t.Errorf("Expected 0 cat usages, got: %d", len(cats))
+	}
+}
+
+func TestRepoMercenaryGetGuildHuntCatsUsed(t *testing.T) {
+	repo, db, charID, guildID := setupMercenaryRepo(t)
+
+	// Insert a guild hunt with cats_used
+	if _, err := db.Exec(
+		`INSERT INTO guild_hunts (guild_id, host_id, destination, level, hunt_data, cats_used, acquired, collected, start)
+		VALUES ($1, $2, 1, 1, $3, '1,2,3', false, false, now())`,
+		guildID, charID, []byte{0x00},
+	); err != nil {
+		t.Fatalf("Setup guild_hunts failed: %v", err)
+	}
+
+	cats, err := repo.GetGuildHuntCatsUsed(charID)
+	if err != nil {
+		t.Fatalf("GetGuildHuntCatsUsed failed: %v", err)
+	}
+	if len(cats) != 1 {
+		t.Fatalf("Expected 1 cat usage, got: %d", len(cats))
+	}
+	if cats[0].CatsUsed != "1,2,3" {
+		t.Errorf("Expected cats_used='1,2,3', got: %q", cats[0].CatsUsed)
+	}
+}
+
+func TestRepoMercenaryGetGuildAirouEmpty(t *testing.T) {
+	repo, _, _, guildID := setupMercenaryRepo(t)
+
+	airou, err := repo.GetGuildAirou(guildID)
+	if err != nil {
+		t.Fatalf("GetGuildAirou failed: %v", err)
+	}
+	if len(airou) != 0 {
+		t.Errorf("Expected 0 airou, got: %d", len(airou))
+	}
+}
+
+func TestRepoMercenaryGetGuildAirou(t *testing.T) {
+	repo, db, charID, guildID := setupMercenaryRepo(t)
+
+	// Set otomoairou on the character
+	airouData := []byte{0xAA, 0xBB, 0xCC}
+	if _, err := db.Exec("UPDATE characters SET otomoairou=$1 WHERE id=$2", airouData, charID); err != nil {
+		t.Fatalf("Setup otomoairou failed: %v", err)
+	}
+
+	airou, err := repo.GetGuildAirou(guildID)
+	if err != nil {
+		t.Fatalf("GetGuildAirou failed: %v", err)
+	}
+	if len(airou) != 1 {
+		t.Fatalf("Expected 1 airou, got: %d", len(airou))
+	}
+	if len(airou[0]) != 3 || airou[0][0] != 0xAA {
+		t.Errorf("Expected airou data, got: %x", airou[0])
+	}
+}