diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
new file mode 100644
index 0000000..13021b8
--- /dev/null
+++ b/.github/workflows/go.yml
@@ -0,0 +1,32 @@
+# This workflow will build a golang project
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go
+
+name: Go
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.23.x'
+
+    - name: Test
+      run: go test -v ./util ./api
+
+    - name: Build
+      run: go build -v .
diff --git a/Dockerfile b/Dockerfile
index 2e181b0..2ee90ed 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,7 +27,7 @@ COPY go.mod go.sum ./
 RUN go mod download
 # Copy all files and subfolders in current state as is.
 COPY . .
-COPY ./confdata /go/bin/config
+COPY ./appdata /go/bin/config
 
 # Set executable rights to all shell-scripts.
 RUN chmod +x ./task/*.sh
diff --git a/api/auth.go b/api/auth.go
index f9f0bf4..23a6103 100644
--- a/api/auth.go
+++ b/api/auth.go
@@ -43,7 +43,7 @@ var (
 	ErrBadJwtID = errors.New("jwt-token id does not refer to registered user")
 	ErrNoAuth   = errors.New("authorization is required")
 	ErrNoScheme = errors.New("authorization does not have expected scheme")
-	ErrNoSecret = errors.New("expected password or SHA25 hash on it and current time as a nonce")
+	ErrNoSecret = errors.New("expected password or SHA256 hash on it and current time as a nonce")
 	ErrSmallKey = errors.New("password too small")
 	ErrNoCred   = errors.New("user with given credentials does not registered")
 	ErrActivate = errors.New("activation required for this account")
diff --git a/api/play_test.go b/api/play_test.go
new file mode 100644
index 0000000..ed29685
--- /dev/null
+++ b/api/play_test.go
@@ -0,0 +1,166 @@
+package api_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"math/rand"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/slotopol/server/api"
+	"github.com/slotopol/server/cmd"
+	cfg "github.com/slotopol/server/config"
+
+	"github.com/gin-gonic/gin"
+)
+
+const email, secret = "player@example.org", "iVI05M"
+
+func ping(t *testing.T, r *gin.Engine) {
+	var req = httptest.NewRequest("GET", "/ping", nil)
+	var w = httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+	if w.Code != http.StatusOK {
+		t.Error("ping is not ok")
+	}
+	var resp = w.Result()
+	if !strings.HasPrefix(resp.Header.Get("Server"), "slotopol/") {
+		t.Error("alien server")
+	}
+}
+
+func post(t *testing.T, r *gin.Engine, path string, token string, arg any) (ret gin.H) {
+	var err error
+	var b []byte
+
+	if b, err = json.Marshal(arg); err != nil {
+		t.Error(err)
+	}
+	var req = httptest.NewRequest("POST", path, bytes.NewReader(b))
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "application/json")
+	if token != "" {
+		req.Header.Set("Authorization", "Bearer "+token)
+	}
+	var w = httptest.NewRecorder()
+	r.ServeHTTP(w, req)
+	if w.Code == http.StatusNoContent {
+		return
+	}
+	if w.Code != http.StatusOK {
+		t.Errorf("'%s' is not ok, status %d", path, w.Code)
+	}
+	var resp = w.Result()
+	if b, err = io.ReadAll(resp.Body); err != nil {
+		t.Error(err)
+	}
+	if err = json.Unmarshal(b, &ret); err != nil {
+		t.Error(err)
+	}
+	if w.Code != http.StatusOK {
+		t.Logf("message: %v, code: %v", ret["what"], ret["code"])
+	}
+	return
+}
+
+func TestPlay(t *testing.T) {
+	var err error
+	var arg, ret gin.H
+	var token string
+	var gid any
+
+	// Prepare in-memory database
+	cfg.CfgPath = "../appdata"
+	if err = cmd.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	gin.SetMode(gin.DebugMode)
+	var r = gin.New()
+	r.HandleMethodNotAllowed = true
+	api.Router(r)
+
+	// Send "ping" and check that server is our
+	ping(t, r)
+
+	// Sign-in player
+	arg = gin.H{
+		"email":  email,
+		"secret": secret,
+	}
+	ret = post(t, r, "/signin", "", arg)
+	token = ret["access"].(string)
+
+	// Join game
+	arg = gin.H{
+		"cid":   1, // 'virtual' club
+		"uid":   3, // player ID
+		"alias": "Novomatic / Dolphins Pearl",
+	}
+	ret = post(t, r, "/game/join", token, arg)
+	gid = ret["gid"]
+
+	arg = gin.H{
+		"gid": gid,
+		"bet": 1,
+	}
+	post(t, r, "/slot/bet/set", token, arg)
+	arg = gin.H{
+		"gid": gid,
+		"sel": 5,
+	}
+	post(t, r, "/slot/sel/set", token, arg)
+
+	// Play the game with 50 spins
+	for range 50 {
+		// make spin
+		arg = gin.H{
+			"gid": gid,
+		}
+		ret = post(t, r, "/slot/spin", token, arg)
+		t.Logf("[spin] gid: %v, sid: %v, wallet: %v", gid, ret["sid"], ret["wallet"])
+		var game = ret["game"].(map[string]any)
+
+		// no any more actions on free spins
+		if _, ok := game["fsr"]; ok {
+			continue
+		}
+		if _, ok := game["gain"]; !ok {
+			continue
+		}
+		t.Logf("gain: %v", game["gain"])
+
+		// if there has a win, make double-ups sometime
+		if rand.Float64() < 0.3 {
+			for {
+				arg = gin.H{
+					"gid":  gid,
+					"mult": 2,
+				}
+				ret = post(t, r, "/slot/doubleup", token, arg)
+				var gain = ret["gain"].(float64)
+				t.Logf("[doubleup] gid: %v, id: %v, wallet: %v, gain: %g", gid, ret["id"], ret["wallet"], gain)
+				if gain == 0 {
+					break
+				}
+				if rand.Float64() < 0.5 {
+					arg = gin.H{
+						"gid": gid,
+					}
+					post(t, r, "/slot/collect", token, arg)
+					t.Logf("[collect] gid: %v", gid)
+					break
+				}
+			}
+		}
+	}
+
+	// Part game
+	arg = gin.H{
+		"gid": gid,
+	}
+	post(t, r, "/game/part", token, arg)
+}
diff --git a/cmd/startup.go b/cmd/startup.go
index fa2704a..5bc1f69 100644
--- a/cmd/startup.go
+++ b/cmd/startup.go
@@ -86,7 +86,13 @@ func InitStorage() (err error) {
 	}
 
 	if Cfg.DriverName == "sqlite3" {
-		cfg.XormStorage, err = xorm.NewEngine(Cfg.DriverName, util.JoinPath(cfg.SqlPath, Cfg.ClubSourceName))
+		var fpath string
+		if Cfg.ClubSourceName != ":memory:" {
+			fpath = util.JoinPath(cfg.SqlPath, Cfg.ClubSourceName)
+		} else {
+			fpath = Cfg.ClubSourceName
+		}
+		cfg.XormStorage, err = xorm.NewEngine(Cfg.DriverName, fpath)
 	} else {
 		cfg.XormStorage, err = xorm.NewEngine(Cfg.DriverName, Cfg.ClubSourceName)
 	}
@@ -226,7 +232,13 @@ func InitSpinlog() (err error) {
 	}
 
 	if Cfg.DriverName == "sqlite3" {
-		cfg.XormSpinlog, err = xorm.NewEngine(Cfg.DriverName, util.JoinPath(cfg.SqlPath, Cfg.SpinSourceName))
+		var fpath string
+		if Cfg.SpinSourceName != ":memory:" {
+			fpath = util.JoinPath(cfg.SqlPath, Cfg.SpinSourceName)
+		} else {
+			fpath = Cfg.SpinSourceName
+		}
+		cfg.XormSpinlog, err = xorm.NewEngine(Cfg.DriverName, fpath)
 	} else {
 		cfg.XormSpinlog, err = xorm.NewEngine(Cfg.DriverName, Cfg.SpinSourceName)
 	}
diff --git a/config/cfgpath.go b/config/cfgpath.go
index 29a269d..d92373a 100644
--- a/config/cfgpath.go
+++ b/config/cfgpath.go
@@ -74,6 +74,7 @@ func InitConfig() {
 		viper.AddConfigPath(filepath.Join(ExePath, sub))
 		viper.AddConfigPath(ExePath)
 		viper.AddConfigPath(sub)
+		viper.AddConfigPath("appdata")
 		viper.AddConfigPath(".")
 		if home, err := os.UserHomeDir(); err == nil {
 			viper.AddConfigPath(filepath.Join(home, sub))
diff --git a/config/config.go b/config/config.go
index 2a20e9c..abeb502 100644
--- a/config/config.go
+++ b/config/config.go
@@ -131,12 +131,12 @@ var Cfg = &Config{
 	},
 	CfgXormDrv: CfgXormDrv{
 		DriverName:       "sqlite3",
-		ClubSourceName:   "slot-club.sqlite",
-		SpinSourceName:   "slot-spin.sqlite",
+		ClubSourceName:   ":memory:",
+		SpinSourceName:   ":memory:",
 		SqlFlushTick:     2500 * time.Millisecond,
-		ClubUpdateBuffer: 200,
-		ClubInsertBuffer: 150,
-		SpinInsertBuffer: 250,
+		ClubUpdateBuffer: 1,
+		ClubInsertBuffer: 1,
+		SpinInsertBuffer: 1,
 	},
 	CfgGameplay: CfgGameplay{
 		AdjunctLimit:    100000,
diff --git a/task/build-linux-x64.cmd b/task/build-linux-x64.cmd
index da392bc..3978232 100644
--- a/task/build-linux-x64.cmd
+++ b/task/build-linux-x64.cmd
@@ -3,7 +3,7 @@ rem This script compiles project for Linux amd64.
 rem It produces static C-libraries linkage.
 
 set wd=%~dp0..
-xcopy %wd%\confdata %GOPATH%\bin\config /f /d /i /e /k /y
+xcopy %wd%\appdata %GOPATH%\bin\config /f /d /i /e /k /y
 
 for /F "tokens=*" %%g in ('git describe --tags') do (set buildvers=%%g)
 for /f "tokens=2 delims==" %%g in ('wmic os get localdatetime /value') do set dt=%%g
diff --git a/task/build-linux-x64.sh b/task/build-linux-x64.sh
index 4a552e7..8de5fb3 100644
--- a/task/build-linux-x64.sh
+++ b/task/build-linux-x64.sh
@@ -3,7 +3,7 @@
 # It produces static C-libraries linkage.
 
 wd=$(realpath -s "$(dirname "$0")/..")
-cp -ruv "$wd/confdata/"* "$GOPATH/bin/config"
+cp -ruv "$wd/appdata/"* "$GOPATH/bin/config"
 
 buildvers=$(git describe --tags)
 # See https://tc39.es/ecma262/#sec-date-time-string-format
diff --git a/task/build-win-x64-slotopol.sh b/task/build-win-x64-slotopol.sh
index a9a1df2..8b769c8 100644
--- a/task/build-win-x64-slotopol.sh
+++ b/task/build-win-x64-slotopol.sh
@@ -3,7 +3,7 @@
 # It produces static C-libraries linkage.
 
 wd=$(realpath -s "$(dirname "$0")/..")
-cp -ruv "$wd/confdata/"* "$GOPATH/bin/config"
+cp -ruv "$wd/appdata/"* "$GOPATH/bin/config"
 
 buildvers=$(git describe --tags)
 # See https://tc39.es/ecma262/#sec-date-time-string-format
diff --git a/task/build-win-x64.cmd b/task/build-win-x64.cmd
index 6e068d0..e1c414f 100644
--- a/task/build-win-x64.cmd
+++ b/task/build-win-x64.cmd
@@ -3,7 +3,7 @@ rem This script compiles project for Windows amd64.
 rem It produces static C-libraries linkage.
 
 set wd=%~dp0..
-xcopy %wd%\confdata %GOPATH%\bin\config /f /d /i /e /k /y
+xcopy %wd%\appdata %GOPATH%\bin\config /f /d /i /e /k /y
 
 for /F "tokens=*" %%g in ('git describe --tags') do (set buildvers=%%g)
 for /f "tokens=2 delims==" %%g in ('wmic os get localdatetime /value') do set dt=%%g
diff --git a/task/build-win-x64.sh b/task/build-win-x64.sh
index 2cfd4d4..02ac6cb 100644
--- a/task/build-win-x64.sh
+++ b/task/build-win-x64.sh
@@ -3,7 +3,7 @@
 # It produces static C-libraries linkage.
 
 wd=$(realpath -s "$(dirname "$0")/..")
-cp -ruv "$wd/confdata/"* "$GOPATH/bin/config"
+cp -ruv "$wd/appdata/"* "$GOPATH/bin/config"
 
 buildvers=$(git describe --tags)
 # See https://tc39.es/ecma262/#sec-date-time-string-format
diff --git a/task/build-win-x86.cmd b/task/build-win-x86.cmd
index d4cdf1c..b932535 100644
--- a/task/build-win-x86.cmd
+++ b/task/build-win-x86.cmd
@@ -3,7 +3,7 @@ rem This script compiles project for Windows x86.
 rem It produces static C-libraries linkage.
 
 set wd=%~dp0..
-xcopy %wd%\confdata %GOPATH%\bin\config /f /d /i /e /k /y
+xcopy %wd%\appdata %GOPATH%\bin\config /f /d /i /e /k /y
 
 for /F "tokens=*" %%g in ('git describe --tags') do (set buildvers=%%g)
 for /f "tokens=2 delims==" %%g in ('wmic os get localdatetime /value') do set dt=%%g
diff --git a/task/build-win-x86.sh b/task/build-win-x86.sh
index 6800fea..002af82 100644
--- a/task/build-win-x86.sh
+++ b/task/build-win-x86.sh
@@ -3,7 +3,7 @@
 # It produces static C-libraries linkage.
 
 wd=$(realpath -s "$(dirname "$0")/..")
-cp -ruv "$wd/confdata/"* "$GOPATH/bin/config"
+cp -ruv "$wd/appdata/"* "$GOPATH/bin/config"
 
 buildvers=$(git describe --tags)
 # See https://tc39.es/ecma262/#sec-date-time-string-format