diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..7c45191
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,23 @@
+module red-apter
+
+go 1.24.0
+
+toolchain go1.24.12
+
+require (
+	github.com/lib/pq v1.11.1
+	modernc.org/sqlite v1.44.3
+)
+
+require (
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
+	golang.org/x/sys v0.37.0 // indirect
+	modernc.org/libc v1.67.6 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..96d44c3
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,55 @@
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
+github.com/lib/pq v1.11.1 h1:wuChtj2hfsGmmx3nf1m7xC2XpK6OtelS2shMY+bGMtI=
+github.com/lib/pq v1.11.1/go.mod h1:/p+8NSbOcwzAEI7wiMXFlgydTwcgTr3OSKMsD2BitpA=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
+github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
+github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 h1:mgKeJMpvi0yx/sU5GsxQ7p6s2wtOnGAHZWCHUM4KGzY=
+golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546/go.mod h1:j/pmGrbnkbPtQfxEe5D0VQhZC6qKbfKifgD0oM7sR70=
+golang.org/x/mod v0.29.0 h1:HV8lRxZC4l2cr3Zq1LvtOsi/ThTgWnUk/y64QSs8GwA=
+golang.org/x/mod v0.29.0/go.mod h1:NyhrlYXJ2H4eJiRy/WDBO6HMqZQ6q9nk4JzS3NuCK+w=
+golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
+golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
+golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
+golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=
+modernc.org/cc/v4 v4.27.1 h1:9W30zRlYrefrDV2JE2O8VDtJ1yPGownxciz5rrbQZis=
+modernc.org/cc/v4 v4.27.1/go.mod h1:uVtb5OGqUKpoLWhqwNQo/8LwvoiEBLvZXIQ/SmO6mL0=
+modernc.org/ccgo/v4 v4.30.1 h1:4r4U1J6Fhj98NKfSjnPUN7Ze2c6MnAdL0hWw6+LrJpc=
+modernc.org/ccgo/v4 v4.30.1/go.mod h1:bIOeI1JL54Utlxn+LwrFyjCx2n2RDiYEaJVSrgdrRfM=
+modernc.org/fileutil v1.3.40 h1:ZGMswMNc9JOCrcrakF1HrvmergNLAmxOPjizirpfqBA=
+modernc.org/fileutil v1.3.40/go.mod h1:HxmghZSZVAz/LXcMNwZPA/DRrQZEVP9VX0V4LQGQFOc=
+modernc.org/gc/v2 v2.6.5 h1:nyqdV8q46KvTpZlsw66kWqwXRHdjIlJOhG6kxiV/9xI=
+modernc.org/gc/v2 v2.6.5/go.mod h1:YgIahr1ypgfe7chRuJi2gD7DBQiKSLMPgBQe9oIiito=
+modernc.org/gc/v3 v3.1.1 h1:k8T3gkXWY9sEiytKhcgyiZ2L0DTyCQ/nvX+LoCljoRE=
+modernc.org/gc/v3 v3.1.1/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
+modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
+modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
+modernc.org/libc v1.67.6 h1:eVOQvpModVLKOdT+LvBPjdQqfrZq+pC39BygcT+E7OI=
+modernc.org/libc v1.67.6/go.mod h1:JAhxUVlolfYDErnwiqaLvUqc8nfb2r6S6slAgZOnaiE=
+modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
+modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
+modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
+modernc.org/memory v1.11.0/go.mod h1:/JP4VbVC+K5sU2wZi9bHoq2MAkCnrt2r98UGeSK7Mjw=
+modernc.org/opt v0.1.4 h1:2kNGMRiUjrp4LcaPuLY2PzUfqM/w9N23quVwhKt5Qm8=
+modernc.org/opt v0.1.4/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
+modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
+modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
+modernc.org/sqlite v1.44.3 h1:+39JvV/HWMcYslAwRxHb8067w+2zowvFOUrOWIy9PjY=
+modernc.org/sqlite v1.44.3/go.mod h1:CzbrU2lSB1DKUusvwGz7rqEKIq+NUd8GWuBBZDs9/nA=
+modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
+modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
+modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
+modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..d0d849b
--- /dev/null
+++ b/main.go
@@ -0,0 +1,17 @@
+package main
+
+import (
+	"context"
+	"os/signal"
+	"red-apter/src"
+	"syscall"
+)
+
+func main() {
+	ctx, can := signal.NotifyContext(context.Background(), syscall.SIGINT)
+	defer can()
+
+	if err := src.Main(ctx); err != nil {
+		panic(err)
+	}
+}
diff --git a/src/adapt.go b/src/adapt.go
new file mode 100644
index 0000000..6790861
--- /dev/null
+++ b/src/adapt.go
@@ -0,0 +1,13 @@
+package src
+
+import (
+	"context"
+	"io"
+	"net"
+)
+
+func adapt(ctx context.Context, config Config, conn net.Conn) error {
+	for ctx.Err() == nil {
+	}
+	return io.EOF
+}
diff --git a/src/config.go b/src/config.go
new file mode 100644
index 0000000..899d403
--- /dev/null
+++ b/src/config.go
@@ -0,0 +1,53 @@
+package src
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"os"
+)
+
+type Config struct {
+	Listen           string `json:"LISTEN"`
+	ConnectionDriver string `json:"CONNECTION_DRIVER"`
+	ConnectionString string `json:"CONNECTION_STRING"`
+	db               DB
+}
+
+func NewConfig(ctx context.Context) (Config, error) {
+	config, err := newConfig()
+	if err != nil {
+		return config, err
+	}
+
+	db, err := NewDB(ctx, config.ConnectionDriver, config.ConnectionString)
+	if err != nil {
+		return config, err
+	}
+	config.db = db
+
+	return config, io.EOF
+}
+
+func newConfig() (Config, error) {
+	config := Config{
+		Listen:           ":10000",
+		ConnectionDriver: "sqlite",
+		ConnectionString: "/tmp/red-apter.db",
+	}
+	b, _ := json.Marshal(config)
+	var m map[string]any
+	if err := json.Unmarshal(b, &m); err != nil {
+		return config, err
+	}
+	for k := range m {
+		if v := os.Getenv(k); v != "" {
+			m[k] = v
+		}
+	}
+	b2, _ := json.Marshal(m)
+	if err := json.Unmarshal(b2, &config); err != nil {
+		return config, err
+	}
+	return config, nil
+}
diff --git a/src/db.go b/src/db.go
new file mode 100644
index 0000000..d963c5f
--- /dev/null
+++ b/src/db.go
@@ -0,0 +1,94 @@
+package src
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+
+	_ "github.com/lib/pq"
+	_ "modernc.org/sqlite"
+)
+
+type DB struct {
+	*sql.DB
+}
+
+func NewDB(ctx context.Context, driver, conn string) (DB, error) {
+	sql, err := sql.Open(driver, conn)
+	if err != nil {
+		return DB{}, err
+	}
+	db := DB{sql}
+
+	if err := db.setup(ctx); err != nil {
+		db.Close()
+		return db, err
+	}
+
+	return db, nil
+}
+
+func (db DB) setup(ctx context.Context) error {
+	if err := db.PingContext(ctx); err != nil {
+		return err
+	}
+	if _, err := db.ExecContext(ctx, `
+		CREATE TABLE data (
+			database INTEGER
+			, key TEXT
+			, value TEXT
+			, PRIMARY KEY (database, key)
+		)
+	`); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (db DB) Get(ctx context.Context, database int, k string) (any, error) {
+	row := db.QueryRowContext(ctx, `
+		SELECT value
+		FROM data
+		WHERE database=$1 AND key=$2
+	`, database, k)
+	if err := row.Err(); err != nil {
+		return nil, err
+	}
+
+	var v string
+	if err := row.Scan(&v); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	var a any
+	if err := json.Unmarshal([]byte(v), &a); err != nil {
+		return nil, err
+	}
+
+	return a, nil
+}
+
+func (db DB) Put(ctx context.Context, database int, k string, v any) error {
+	b, _ := json.Marshal(v)
+	_, err := db.ExecContext(ctx, `
+		INSERT INTO data (database, key, value)
+		VALUES ($1, $2, $3)
+
+		ON CONFLICT DO UPDATE
+
+		SET value = $3
+		WHERE database = $1 AND key = $2
+	`, database, k, string(b))
+	return err
+}
+
+func (db DB) Del(ctx context.Context, database int, k string) error {
+	_, err := db.ExecContext(ctx, `
+		DELETE FROM data
+		WHERE database=$1 AND key=$2
+	`, database, k)
+	return err
+}
diff --git a/src/db_test.go b/src/db_test.go
new file mode 100644
index 0000000..11ab434
--- /dev/null
+++ b/src/db_test.go
@@ -0,0 +1,50 @@
+package src_test
+
+import (
+	"context"
+	"path"
+	"red-apter/src"
+	"testing"
+	"time"
+)
+
+func TestDBSqlite(t *testing.T) {
+	ctx, can := context.WithTimeout(context.Background(), time.Minute)
+	defer can()
+
+	db, err := src.NewDB(ctx, "sqlite", path.Join(t.TempDir(), "db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { db.Close() })
+
+	if v, err := db.Get(ctx, 5, "k"); err != nil {
+		t.Error("failed get 404:", err)
+	} else if v != nil {
+		t.Error("got 404:", v)
+	}
+
+	if err := db.Put(ctx, 5, "k", 6); err != nil {
+		t.Error("failed insert:", err)
+	} else if err := db.Put(ctx, 5, "k", 7); err != nil {
+		t.Error("failed update:", err)
+	}
+
+	if v, err := db.Get(ctx, 5, "k"); err != nil {
+		t.Error("failed get:", err)
+	} else if v != float64(7) {
+		t.Errorf("wrong get: (%T) %v but wanted 7", v, v)
+	}
+
+	if err := db.Del(ctx, 5, "k"); err != nil {
+		t.Error("failed del:", err)
+	} else if err := db.Del(ctx, 5, "k"); err != nil {
+		t.Error("failed del 404:", err)
+	}
+
+	if v, err := db.Get(ctx, 5, "k"); err != nil {
+		t.Error("failed get 410:", err)
+	} else if v != nil {
+		t.Error("wrong get 410:", v)
+	}
+}
diff --git a/src/listen.go b/src/listen.go
new file mode 100644
index 0000000..8b0b7a7
--- /dev/null
+++ b/src/listen.go
@@ -0,0 +1,53 @@
+package src
+
+import (
+	"context"
+	"log"
+	"net"
+	"sync"
+)
+
+func listen(ctx context.Context, config Config) error {
+	wg := &sync.WaitGroup{}
+	defer wg.Wait()
+
+	listener, err := net.Listen("tcp", config.Listen)
+	if err != nil {
+		return err
+	}
+	defer listener.Close()
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		<-ctx.Done()
+		listener.Close()
+	}()
+
+	for ctx.Err() == nil {
+		conn, err := listener.Accept()
+		if err != nil {
+			log.Println("error accepting:", err)
+		} else {
+			wg.Add(1)
+			go func() {
+				defer wg.Done()
+				handle(ctx, config, conn)
+			}()
+		}
+	}
+
+	return ctx.Err()
+}
+
+func handle(ctx context.Context, config Config, conn net.Conn) {
+	if err := _handle(ctx, config, conn); err != nil {
+		log.Println("error handling:", err)
+	}
+}
+
+func _handle(ctx context.Context, config Config, conn net.Conn) error {
+	defer conn.Close()
+
+	return adapt(ctx, config, conn)
+}
diff --git a/src/main.go b/src/main.go
new file mode 100644
index 0000000..5601a06
--- /dev/null
+++ b/src/main.go
@@ -0,0 +1,19 @@
+package src
+
+import (
+	"context"
+)
+
+func Main(ctx context.Context) error {
+	config, err := NewConfig(ctx)
+	if err != nil {
+		return err
+	}
+	defer config.db.Close()
+
+	if err := listen(ctx, config); err != nil && ctx.Err() == nil {
+		return err
+	}
+
+	return nil
+}