refactor(store): migration files + embed.FS

- migrations/001_init.sql + 002_target_extras.sql extraidos de schema inline
- store.go: applyMigrations() con embed.FS, splitSQLStatements, isIdempotentError
- aplica regla db_migrations.md (fn_registry/.claude/rules/)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

migrations/001_init.sql

@@ -0,0 +1,26 @@
+-- deploy_server initial schema. Tracks deploy targets (per app+host) and execution history.
+
+CREATE TABLE IF NOT EXISTS deploy_targets (
+    app           TEXT NOT NULL,
+    host          TEXT NOT NULL,
+    remote_dir    TEXT NOT NULL DEFAULT '',
+    binary_name   TEXT NOT NULL DEFAULT '',
+    build_cmd     TEXT NOT NULL DEFAULT '',
+    service_user  TEXT NOT NULL DEFAULT '',
+    port          INTEGER NOT NULL DEFAULT 0,
+    health_path   TEXT NOT NULL DEFAULT '',
+    env           TEXT NOT NULL DEFAULT '{}',
+    created_at    TEXT NOT NULL,
+    PRIMARY KEY (app, host)
+);
+
+CREATE TABLE IF NOT EXISTS deploy_logs (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    app         TEXT NOT NULL,
+    host        TEXT NOT NULL,
+    status      TEXT NOT NULL,
+    trigger     TEXT NOT NULL DEFAULT 'manual',
+    error       TEXT NOT NULL DEFAULT '',
+    duration_ms INTEGER NOT NULL DEFAULT 0,
+    started_at  TEXT NOT NULL
+);

migrations/002_target_extras.sql

@@ -0,0 +1,6 @@
+-- Extra deploy_targets columns: strategy, source_dir, branch, compose_files.
+-- Aplicacion idempotente: store.go captura "duplicate column" para DBs preexistentes.
+ALTER TABLE deploy_targets ADD COLUMN strategy      TEXT NOT NULL DEFAULT 'systemd';
+ALTER TABLE deploy_targets ADD COLUMN source_dir    TEXT NOT NULL DEFAULT '';
+ALTER TABLE deploy_targets ADD COLUMN branch        TEXT NOT NULL DEFAULT 'main';
+ALTER TABLE deploy_targets ADD COLUMN compose_files TEXT NOT NULL DEFAULT '';

store.go

@@ -2,13 +2,20 @@ package main
 
 import (
 	"database/sql"
+	"embed"
 	"encoding/json"
 	"fmt"
+	"io/fs"
+	"sort"
+	"strings"
 	"time"
 
 	_ "github.com/mattn/go-sqlite3"
 )
 
+//go:embed migrations/*.sql
+var migrationsFS embed.FS
+
 // DeployTarget represents a deploy configuration stored in operations.db.
 type DeployTarget struct {
 	App          string            `json:"app"`
@@ -62,50 +69,63 @@ func (s *Store) Close() error {
 }
 
 func (s *Store) migrate() error {
-	_, err := s.db.Exec(`
-		CREATE TABLE IF NOT EXISTS deploy_targets (
-			app           TEXT NOT NULL,
-			host          TEXT NOT NULL,
-			remote_dir    TEXT NOT NULL DEFAULT '',
-			binary_name   TEXT NOT NULL DEFAULT '',
-			build_cmd     TEXT NOT NULL DEFAULT '',
-			service_user  TEXT NOT NULL DEFAULT '',
-			port          INTEGER NOT NULL DEFAULT 0,
-			health_path   TEXT NOT NULL DEFAULT '',
-			env           TEXT NOT NULL DEFAULT '{}',
-			strategy      TEXT NOT NULL DEFAULT 'systemd',
-			source_dir    TEXT NOT NULL DEFAULT '',
-			branch        TEXT NOT NULL DEFAULT 'main',
-			compose_files TEXT NOT NULL DEFAULT '',
-			created_at    TEXT NOT NULL,
-			PRIMARY KEY (app, host)
-		);
-		CREATE TABLE IF NOT EXISTS deploy_logs (
-			id         INTEGER PRIMARY KEY AUTOINCREMENT,
-			app        TEXT NOT NULL,
-			host       TEXT NOT NULL,
-			status     TEXT NOT NULL,
-			trigger    TEXT NOT NULL DEFAULT 'manual',
-			error      TEXT NOT NULL DEFAULT '',
-			duration_ms INTEGER NOT NULL DEFAULT 0,
-			started_at TEXT NOT NULL
-		);
-	`)
+	files, err := fs.Glob(migrationsFS, "migrations/*.sql")
 	if err != nil {
 		return err
 	}
-	// Idempotent column additions for existing databases
-	for _, col := range []string{
-		"ALTER TABLE deploy_targets ADD COLUMN strategy TEXT NOT NULL DEFAULT 'systemd'",
-		"ALTER TABLE deploy_targets ADD COLUMN source_dir TEXT NOT NULL DEFAULT ''",
-		"ALTER TABLE deploy_targets ADD COLUMN branch TEXT NOT NULL DEFAULT 'main'",
-		"ALTER TABLE deploy_targets ADD COLUMN compose_files TEXT NOT NULL DEFAULT ''",
-	} {
-		s.db.Exec(col) // ignore "duplicate column" errors
+	sort.Strings(files)
+	for _, f := range files {
+		b, err := migrationsFS.ReadFile(f)
+		if err != nil {
+			return err
+		}
+		// Split por sentencia para que cada ALTER pueda fallar idempotentemente
+		// sin abortar el resto. SQLite acepta multiples sentencias en Exec(),
+		// pero no ignora duplicados — ejecutamos una a una.
+		stmts := splitSQLStatements(string(b))
+		for _, stmt := range stmts {
+			s2 := strings.TrimSpace(stmt)
+			if s2 == "" {
+				continue
+			}
+			if _, err := s.db.Exec(s2); err != nil {
+				if isIdempotentError(err) {
+					continue
+				}
+				return fmt.Errorf("migrate %s: %w", f, err)
+			}
+		}
 	}
 	return nil
 }
 
+func splitSQLStatements(s string) []string {
+	out := []string{}
+	cur := strings.Builder{}
+	for _, line := range strings.Split(s, "\n") {
+		trim := strings.TrimSpace(line)
+		if strings.HasPrefix(trim, "--") || trim == "" {
+			continue
+		}
+		cur.WriteString(line)
+		cur.WriteString("\n")
+		if strings.HasSuffix(trim, ";") {
+			out = append(out, cur.String())
+			cur.Reset()
+		}
+	}
+	if cur.Len() > 0 {
+		out = append(out, cur.String())
+	}
+	return out
+}
+
+func isIdempotentError(err error) bool {
+	msg := err.Error()
+	return strings.Contains(msg, "duplicate column") ||
+		strings.Contains(msg, "already exists")
+}
+
 func (s *Store) AddTarget(t DeployTarget) error {
 	envJSON, _ := json.Marshal(t.Env)
 	if t.Strategy == "" {