Fix #4803: Use atomic.Bool for initialisationComplete flag

Replace the plain boolean initialisationComplete field with atomic.Bool
to prevent data races when accessed concurrently by multiple goroutines.

Changes:
- Change field type from bool to atomic.Bool
- Use .Store(true) for writes
- Use .Load() for reads in isInitialised() and handleConnectionUpdateNotification()
- Update test to use atomic operations

The test now passes with -race flag, confirming the race condition is fixed.

pkg/interactive/interactive_client.go

@@ -10,6 +10,7 @@ import (
 	"os/signal"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/alecthomas/chroma/formatters"
@@ -58,7 +59,7 @@ type InteractiveClient struct {
 	// channel used internally to pass the initialisation result
 	initResultChan chan *db_common.InitResult
 	// flag set when initialisation is complete (with or without errors)
-	initialisationComplete bool
+	initialisationComplete atomic.Bool
 	afterClose             AfterPromptCloseAction
 	// lock while execution is occurring to avoid errors/warnings being shown
 	executionLock sync.Mutex
@@ -731,7 +732,7 @@ func (c *InteractiveClient) handleConnectionUpdateNotification(ctx context.Conte
 	// ignore schema update notifications until initialisation is complete
 	// (we may receive schema update messages from the initial refresh connections, but we do not need to reload
 	// the schema as we will have already loaded the correct schema)
-	if !c.initialisationComplete {
+	if !c.initialisationComplete.Load() {
 		log.Printf("[INFO] received schema update notification but ignoring it as we are initializing")
 		return
 	}

pkg/interactive/interactive_client_init.go

@@ -16,7 +16,7 @@ import (
 func (c *InteractiveClient) handleInitResult(ctx context.Context, initResult *db_common.InitResult) {
 	// whatever happens, set initialisationComplete
 	defer func() {
-		c.initialisationComplete = true
+		c.initialisationComplete.Store(true)
 	}()
 
 	if initResult.Error != nil {
@@ -127,7 +127,7 @@ func (c *InteractiveClient) readInitDataStream(ctx context.Context) {
 // return whether the client is initialises
 // there are 3 conditions>
 func (c *InteractiveClient) isInitialised() bool {
-	return c.initialisationComplete
+	return c.initialisationComplete.Load()
 }
 
 func (c *InteractiveClient) waitForInitData(ctx context.Context) error {

pkg/interactive/interactive_client_test.go

@@ -543,9 +543,8 @@ func TestCancelActiveQueryIfAny(t *testing.T) {
 //
 // Bug: #4803
 func TestInitialisationComplete_RaceCondition(t *testing.T) {
-	c := &InteractiveClient{
-		initialisationComplete: false,
-	}
+	c := &InteractiveClient{}
+	c.initialisationComplete.Store(false)
 
 	var wg sync.WaitGroup
 
@@ -554,8 +553,8 @@ func TestInitialisationComplete_RaceCondition(t *testing.T) {
 	go func() {
 		defer wg.Done()
 		for i := 0; i < 100; i++ {
-			c.initialisationComplete = true
-			c.initialisationComplete = false
+			c.initialisationComplete.Store(true)
+			c.initialisationComplete.Store(false)
 		}
 	}()
 
@@ -574,7 +573,7 @@ func TestInitialisationComplete_RaceCondition(t *testing.T) {
 		defer wg.Done()
 		for i := 0; i < 100; i++ {
 			// Check the flag directly (as handleConnectionUpdateNotification does)
-			if !c.initialisationComplete {
+			if !c.initialisationComplete.Load() {
 				continue
 			}
 		}