feat(storage): add sqlite manager and storage config

go.mod

@@ -2,4 +2,17 @@ module github.com/stig/goaichat
 
 go 1.24.6
 
-require gopkg.in/yaml.v3 v3.0.1 // indirect
+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 v0.1.9 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b // indirect
+	golang.org/x/sys v0.34.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	modernc.org/libc v1.66.3 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
+	modernc.org/sqlite v1.39.0 // indirect
+)

go.sum

@@ -1,3 +1,26 @@
+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/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+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 v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
+github.com/ncruces/go-strftime v0.1.9/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 v0.0.0-20250620022241-b7579e27df2b h1:M2rDM6z3Fhozi9O7NWsxAkg/yqS/lQJ6PmkyIV3YP+o=
+golang.org/x/exp v0.0.0-20250620022241-b7579e27df2b/go.mod h1:3//PLf8L/X+8b4vuAfHzxeRUl04Adcb341+IGKfnqS8=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.34.0 h1:H5Y5sJ2L2JRdyv7ROF1he/lPdvFsd0mJHFw2ThKHxLA=
+golang.org/x/sys v0.34.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+modernc.org/libc v1.66.3 h1:cfCbjTUcdsKyyZZfEUKfoHcP3S0Wkvz3jgSzByEWVCQ=
+modernc.org/libc v1.66.3/go.mod h1:XD9zO8kt59cANKvHPXpx7yS2ELPheAey0vjIuZOhOU8=
+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/sqlite v1.39.0 h1:6bwu9Ooim0yVYA7IZn9demiQk/Ejp0BtTjBWFLymSeY=
+modernc.org/sqlite v1.39.0/go.mod h1:cPTJYSlgg3Sfg046yBShXENNtPrWrDX8bsbAQBzgQ5E=

internal/config/config.go

@@ -16,10 +16,11 @@ const (
 
 // Config captures runtime configuration for the Goaichat application.
 type Config struct {
-	API    APIConfig    `yaml:"api"`
-	Model  ModelConfig  `yaml:"model"`
+	API     APIConfig     `yaml:"api"`
+	Model   ModelConfig   `yaml:"model"`
 	Logging LoggingConfig `yaml:"logging"`
-	UI     UIConfig     `yaml:"ui"`
+	UI      UIConfig      `yaml:"ui"`
+	Storage StorageConfig `yaml:"storage"`
 }
 
 // APIConfig holds settings for connecting to the OpenAI-compatible API.
@@ -45,6 +46,13 @@ type UIConfig struct {
 	ShowTimestamps bool `yaml:"show_timestamps"`
 }
 
+// StorageConfig controls persistence locations and metadata.
+type StorageConfig struct {
+	Path     string `yaml:"path"`
+	BaseDir  string `yaml:"base_dir"`
+	Username string `yaml:"username"`
+}
+
 // Load reads configuration from the provided path, falling back to defaults and
 // environment overrides.
 func Load(path string) (*Config, error) {
@@ -123,5 +131,6 @@ func defaultConfig() Config {
 		UI: UIConfig{
 			ShowTimestamps: true,
 		},
+		Storage: StorageConfig{},
 	}
 }

internal/storage/storage.go

@@ -0,0 +1,114 @@
+package storage
+
+import (
+	"database/sql"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"sync"
+
+	_ "modernc.org/sqlite"
+
+	"github.com/stig/goaichat/internal/config"
+)
+
+// Manager handles access to the SQLite database storing chat sessions and metadata.
+type Manager struct {
+	path string
+	cfg  config.StorageConfig
+	mu   sync.Mutex
+	db   *sql.DB
+}
+
+// NewManager constructs a Manager and ensures the data directory exists.
+func NewManager(cfg config.Config) (*Manager, error) {
+	path, err := resolvePath(cfg.Storage)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := ensureDir(filepath.Dir(path)); err != nil {
+		return nil, err
+	}
+
+	return &Manager{path: path, cfg: cfg.Storage}, nil
+}
+
+// Open lazily opens the SQLite database connection.
+func (m *Manager) Open() (*sql.DB, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.db != nil {
+		return m.db, nil
+	}
+
+	dsn := fmt.Sprintf("file:%s?_pragma=journal_mode(WAL)&_busy_timeout=5000", m.path)
+	db, err := sql.Open("sqlite", dsn)
+	if err != nil {
+		return nil, fmt.Errorf("open sqlite: %w", err)
+	}
+
+	if err := db.Ping(); err != nil {
+		_ = db.Close()
+		return nil, fmt.Errorf("ping sqlite: %w", err)
+	}
+
+	m.db = db
+	return db, nil
+}
+
+// Close releases the underlying database connection.
+func (m *Manager) Close() error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.db == nil {
+		return nil
+	}
+
+	err := m.db.Close()
+	m.db = nil
+	return err
+}
+
+func resolvePath(cfg config.StorageConfig) (string, error) {
+	if strings.TrimSpace(cfg.Path) != "" {
+		return cfg.Path, nil
+	}
+
+	username := cfg.Username
+	if username == "" {
+		username = os.Getenv("USER")
+		if username == "" {
+			username = "default"
+		}
+	}
+
+	base := filepath.Join("/var/log/goaichat", username)
+	if cfg.BaseDir != "" {
+		base = cfg.BaseDir
+	}
+
+	return filepath.Join(base, "goaichat.db"), nil
+}
+
+func ensureDir(dir string) error {
+	if dir == "" {
+		return errors.New("directory path cannot be empty")
+	}
+	if err := os.MkdirAll(dir, 0o700); err != nil {
+		return fmt.Errorf("create data directory: %w", err)
+	}
+
+	if runtime.GOOS != "windows" {
+		if err := os.Chmod(dir, 0o700); err != nil {
+			return fmt.Errorf("chmod data directory: %w", err)
+		}
+	}
+
+	return nil
+}