save first version

internal/db/db.go

@@ -0,0 +1,78 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	_ "modernc.org/sqlite"
+)
+
+func Open(path string) (*sql.DB, error) {
+	db, err := sql.Open("sqlite", path+"?_journal=WAL&_timeout=5000&_fk=true")
+	if err != nil {
+		return nil, err
+	}
+	db.SetMaxOpenConns(1) // SQLite is single-writer
+	if err := migrate(db); err != nil {
+		db.Close()
+		return nil, fmt.Errorf("migrate: %w", err)
+	}
+	return db, nil
+}
+
+func migrate(db *sql.DB) error {
+	ctx := context.Background()
+	if _, err := db.ExecContext(ctx, `CREATE TABLE IF NOT EXISTS schema_version (version INTEGER NOT NULL)`); err != nil {
+		return err
+	}
+	var version int
+	db.QueryRowContext(ctx, `SELECT COALESCE(MAX(version),0) FROM schema_version`).Scan(&version) //nolint
+
+	migrations := []string{
+		// v1: core schema
+		`CREATE TABLE IF NOT EXISTS tickets (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			ticket_number INTEGER NOT NULL,
+			user_id TEXT NOT NULL,
+			panel TEXT NOT NULL,
+			type TEXT NOT NULL,
+			channel_id TEXT NOT NULL UNIQUE,
+			opened_at DATETIME NOT NULL,
+			claimed_by TEXT,
+			claimed_at DATETIME,
+			closed_at DATETIME,
+			closed_by TEXT,
+			reason TEXT,
+			transcript_path TEXT,
+			status TEXT NOT NULL DEFAULT 'open'
+		);
+		CREATE INDEX IF NOT EXISTS idx_tickets_user ON tickets(user_id);
+		CREATE INDEX IF NOT EXISTS idx_tickets_status ON tickets(status);
+		CREATE INDEX IF NOT EXISTS idx_tickets_type ON tickets(type);
+		CREATE TABLE IF NOT EXISTS claim_messages (
+			ticket_id INTEGER PRIMARY KEY,
+			message_id TEXT NOT NULL,
+			last_reup_at DATETIME NOT NULL
+		);
+		CREATE TABLE IF NOT EXISTS convocation_counter (
+			id INTEGER PRIMARY KEY CHECK(id=1),
+			count INTEGER NOT NULL DEFAULT 0
+		);
+		INSERT OR IGNORE INTO convocation_counter(id,count) VALUES(1,0);`,
+	}
+
+	for i, m := range migrations {
+		v := i + 1
+		if v <= version {
+			continue
+		}
+		if _, err := db.ExecContext(ctx, m); err != nil {
+			return fmt.Errorf("migration v%d: %w", v, err)
+		}
+		if _, err := db.ExecContext(ctx, `INSERT INTO schema_version(version) VALUES(?)`, v); err != nil {
+			return fmt.Errorf("record migration v%d: %w", v, err)
+		}
+	}
+	return nil
+}