diff --git a/datafactory_tables.go b/datafactory_tables.go
new file mode 100644
index 0000000..e8e2df2
--- /dev/null
+++ b/datafactory_tables.go
@@ -0,0 +1,92 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+type tableInfo struct {
+	Name     string
+	RowCount int64
+}
+
+// listTablesForDatabase returns the list of tables for a given DB file.
+// Supports kind="sqlite" (uses database/sql + sqlite3 driver) and
+// kind="duckdb" (uses python venv subprocess since go-duckdb is not linked
+// in sqlite_api — it lives in the root module, not here).
+func listTablesForDatabase(kind, path string) ([]tableInfo, error) {
+	switch kind {
+	case "sqlite":
+		return listSQLiteTables(path)
+	case "duckdb":
+		return listDuckDBTablesViaCLI(path)
+	default:
+		return nil, fmt.Errorf("unsupported kind: %s", kind)
+	}
+}
+
+func listSQLiteTables(path string) ([]tableInfo, error) {
+	db, err := sql.Open("sqlite3", "file:"+path+"?mode=ro")
+	if err != nil {
+		return nil, err
+	}
+	defer db.Close()
+
+	rows, err := db.Query(`
+		SELECT name FROM sqlite_master
+		WHERE type='table'
+		  AND name NOT LIKE 'sqlite_%'
+		  AND name != '_migrations'
+		ORDER BY name`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var out []tableInfo
+	for rows.Next() {
+		var name string
+		if err := rows.Scan(&name); err != nil {
+			continue
+		}
+		var cnt int64
+		row := db.QueryRow(`SELECT count(*) FROM "` + name + `"`)
+		_ = row.Scan(&cnt)
+		out = append(out, tableInfo{Name: name, RowCount: cnt})
+	}
+	return out, nil
+}
+
+func listDuckDBTablesViaCLI(path string) ([]tableInfo, error) {
+	// Use the python venv's duckdb module to avoid linking go-duckdb.
+	pyBin := "/home/lucas/fn_registry/python/.venv/bin/python3"
+	script := fmt.Sprintf(
+		`import duckdb,sys
+c=duckdb.connect(%q, read_only=True)
+for (name,) in c.execute("SELECT table_name FROM information_schema.tables WHERE table_schema='main' ORDER BY table_name").fetchall():
+    cnt=c.execute(f'SELECT count(*) FROM "{name}"').fetchone()[0]
+    print(f"{name}\t{cnt}")
+`, path)
+	cmd := exec.Command(pyBin, "-c", script)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return nil, fmt.Errorf("duckdb via python: %w (output: %s)", err, string(out))
+	}
+
+	var result []tableInfo
+	for _, line := range strings.Split(strings.TrimSpace(string(out)), "\n") {
+		if line == "" {
+			continue
+		}
+		parts := strings.SplitN(line, "\t", 2)
+		if len(parts) != 2 {
+			continue
+		}
+		cnt, _ := strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 64)
+		result = append(result, tableInfo{Name: parts[0], RowCount: cnt})
+	}
+	return result, nil
+}
diff --git a/handlers.go b/handlers.go
index 4a22b1f..a11acca 100644
--- a/handlers.go
+++ b/handlers.go
@@ -93,6 +93,9 @@ func (s *Server) Routes(mux *http.ServeMux) {
 	mux.HandleFunc("GET /api/datafactory/nodes", s.handleDataFactoryNodes)
 	mux.HandleFunc("GET /api/datafactory/runs", s.handleDataFactoryRuns)
 	mux.HandleFunc("GET /api/datafactory/databases", s.handleDataFactoryDatabases)
+	mux.HandleFunc("GET /api/datafactory/tables", s.handleDataFactoryTables)
+	mux.HandleFunc("GET /api/datafactory/preview", s.handleDataFactoryPreview)
+	mux.HandleFunc("GET /api/functions/{id}", s.handleFunctionByID)
 	mux.HandleFunc("GET /api/ws/datafactory", s.handleDataFactoryEvents(s.dfHub))
 }
 
diff --git a/handlers_datafactory.go b/handlers_datafactory.go
index 3d31719..bd83908 100644
--- a/handlers_datafactory.go
+++ b/handlers_datafactory.go
@@ -15,7 +15,13 @@ package main
 import (
 	"context"
 	"database/sql"
+	"encoding/json"
+	"fmt"
 	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
 	"strconv"
 )
 
@@ -49,6 +55,8 @@ type dataFactoryRun struct {
 	Trigger    string `json:"trigger"`
 	Error      string `json:"error"`
 	Notes      string `json:"notes"`
+	StorageDBID  string `json:"storage_db_id"`
+	StorageTable string `json:"storage_table"`
 }
 
 // dataFactoryDatabase is the JSON row for /api/datafactory/databases.
@@ -136,7 +144,8 @@ func (s *Server) handleDataFactoryRuns(w http.ResponseWriter, r *http.Request) {
 	if nodeID != "" {
 		rows, err = db.QueryContext(ctx, `
 			SELECT id, node_id, started_at, COALESCE(finished_at,''), status,
-			       rows_in, rows_out, kb_in, kb_out, duration_ms, trigger, error, notes
+			       rows_in, rows_out, kb_in, kb_out, duration_ms, trigger, error, notes,
+			       COALESCE(storage_db_id,''), COALESCE(storage_table,'')
 			FROM runs
 			WHERE node_id = ?
 			ORDER BY started_at DESC
@@ -144,7 +153,8 @@ func (s *Server) handleDataFactoryRuns(w http.ResponseWriter, r *http.Request) {
 	} else {
 		rows, err = db.QueryContext(ctx, `
 			SELECT id, node_id, started_at, COALESCE(finished_at,''), status,
-			       rows_in, rows_out, kb_in, kb_out, duration_ms, trigger, error, notes
+			       rows_in, rows_out, kb_in, kb_out, duration_ms, trigger, error, notes,
+			       COALESCE(storage_db_id,''), COALESCE(storage_table,'')
 			FROM runs
 			ORDER BY started_at DESC
 			LIMIT ?`, limit)
@@ -160,7 +170,8 @@ func (s *Server) handleDataFactoryRuns(w http.ResponseWriter, r *http.Request) {
 		var rr dataFactoryRun
 		if err := rows.Scan(&rr.ID, &rr.NodeID, &rr.StartedAt, &rr.FinishedAt,
 			&rr.Status, &rr.RowsIn, &rr.RowsOut, &rr.KbIn, &rr.KbOut,
-			&rr.DurationMS, &rr.Trigger, &rr.Error, &rr.Notes); err != nil {
+			&rr.DurationMS, &rr.Trigger, &rr.Error, &rr.Notes,
+			&rr.StorageDBID, &rr.StorageTable); err != nil {
 			writeError(w, http.StatusInternalServerError, err.Error())
 			return
 		}
@@ -203,3 +214,307 @@ func (s *Server) handleDataFactoryDatabases(w http.ResponseWriter, r *http.Reque
 	}
 	writeJSON(w, http.StatusOK, map[string]any{"databases": out, "count": len(out)})
 }
+
+// dataFactoryTable is the JSON row for /api/datafactory/tables.
+type dataFactoryTable struct {
+	DatabaseID    string `json:"database_id"`
+	DatabaseLabel string `json:"database_label"`
+	DatabaseKind  string `json:"database_kind"`
+	TableName     string `json:"table_name"`
+	RowCount      int64  `json:"row_count"`
+	Error         string `json:"error,omitempty"`
+}
+
+// tableNameRE restricts table names to alphanumeric + underscore + dot.
+// This prevents SQL injection in the preview queries.
+var tableNameRE = regexp.MustCompile(`^[A-Za-z0-9_.]+$`)
+
+// previewColumn is a JSON column descriptor for the preview response.
+type previewColumn struct {
+	Name string `json:"name"`
+	Type string `json:"type"`
+}
+
+// previewResponse is the JSON shape of /api/datafactory/preview.
+type previewResponse struct {
+	DatabaseID string          `json:"database_id"`
+	TableName  string          `json:"table_name"`
+	Columns    []previewColumn `json:"columns"`
+	Rows       [][]string      `json:"rows"`
+	TotalRows  int64           `json:"total_rows"`
+	Limit      int             `json:"limit"`
+	Offset     int             `json:"offset"`
+}
+
+// handleDataFactoryPreview serves:
+//
+//	GET /api/datafactory/preview?database_id=<id>&table=<name>&limit=N&offset=N
+//
+// Supports kind="sqlite" and kind="duckdb" databases registered in
+// data_factory.databases. Returns up to 1000 rows (default 100).
+func (s *Server) handleDataFactoryPreview(w http.ResponseWriter, r *http.Request) {
+	q := r.URL.Query()
+
+	databaseID := q.Get("database_id")
+	tableName := q.Get("table")
+	if databaseID == "" || tableName == "" {
+		writeError(w, http.StatusBadRequest, "database_id and table are required")
+		return
+	}
+	if !tableNameRE.MatchString(tableName) {
+		writeError(w, http.StatusBadRequest,
+			fmt.Sprintf("invalid table name %q: only [A-Za-z0-9_.] allowed", tableName))
+		return
+	}
+
+	limit := 100
+	if l := q.Get("limit"); l != "" {
+		if n, err := strconv.Atoi(l); err == nil {
+			switch {
+			case n < 1:
+				limit = 1
+			case n > 1000:
+				limit = 1000
+			default:
+				limit = n
+			}
+		}
+	}
+	offset := 0
+	if o := q.Get("offset"); o != "" {
+		if n, err := strconv.Atoi(o); err == nil && n >= 0 {
+			offset = n
+		}
+	}
+
+	// Look up the database in data_factory.db.
+	dfDB, err := s.dataFactoryDB()
+	if err != nil {
+		writeError(w, http.StatusServiceUnavailable, "data_factory.db unavailable: "+err.Error())
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(r.Context(), 30*queryTimeout)
+	defer cancel()
+
+	var dbKind, dbURI string
+	row := dfDB.QueryRowContext(ctx, `SELECT kind, uri FROM databases WHERE id = ?`, databaseID)
+	if err := row.Scan(&dbKind, &dbURI); err != nil {
+		if err == sql.ErrNoRows {
+			writeError(w, http.StatusNotFound, fmt.Sprintf("database_id %q not found", databaseID))
+		} else {
+			writeError(w, http.StatusInternalServerError, err.Error())
+		}
+		return
+	}
+
+	// Resolve absolute path.
+	root := os.Getenv("FN_REGISTRY_ROOT")
+	if root == "" {
+		root = "/home/lucas/fn_registry"
+	}
+	dbPath := dbURI
+	if !filepath.IsAbs(dbPath) {
+		dbPath = filepath.Join(root, dbURI)
+	}
+
+	var resp previewResponse
+	resp.DatabaseID = databaseID
+	resp.TableName = tableName
+	resp.Limit = limit
+	resp.Offset = offset
+
+	switch dbKind {
+	case "sqlite":
+		if err := previewSQLite(dbPath, tableName, limit, offset, &resp); err != nil {
+			writeError(w, http.StatusInternalServerError, "sqlite preview: "+err.Error())
+			return
+		}
+	case "duckdb":
+		if err := previewDuckDB(dbPath, tableName, limit, offset, &resp); err != nil {
+			writeError(w, http.StatusInternalServerError, "duckdb preview: "+err.Error())
+			return
+		}
+	default:
+		writeError(w, http.StatusBadRequest, fmt.Sprintf("unsupported database kind: %q", dbKind))
+		return
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+// previewSQLite fetches schema + rows from a SQLite database.
+func previewSQLite(path, table string, limit, offset int, out *previewResponse) error {
+	db, err := sql.Open("sqlite3", "file:"+path+"?mode=ro")
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	// Schema via PRAGMA table_info.
+	rows, err := db.Query(fmt.Sprintf(`PRAGMA table_info("%s")`, table))
+	if err != nil {
+		return fmt.Errorf("PRAGMA table_info: %w", err)
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var cid int
+		var name, typ, dflt string
+		var notNull, pk int
+		if err := rows.Scan(&cid, &name, &typ, &notNull, &dflt, &pk); err != nil {
+			return err
+		}
+		out.Columns = append(out.Columns, previewColumn{Name: name, Type: typ})
+	}
+	_ = rows.Close()
+	if len(out.Columns) == 0 {
+		return fmt.Errorf("table %q not found or has no columns", table)
+	}
+
+	// Total row count.
+	cntRow := db.QueryRow(fmt.Sprintf(`SELECT count(*) FROM "%s"`, table))
+	_ = cntRow.Scan(&out.TotalRows)
+
+	// Data rows.
+	dataRows, err := db.Query(
+		fmt.Sprintf(`SELECT * FROM "%s" LIMIT ? OFFSET ?`, table),
+		limit, offset,
+	)
+	if err != nil {
+		return fmt.Errorf("SELECT: %w", err)
+	}
+	defer dataRows.Close()
+
+	nCols := len(out.Columns)
+	for dataRows.Next() {
+		vals := make([]interface{}, nCols)
+		ptrs := make([]interface{}, nCols)
+		for i := range vals {
+			ptrs[i] = &vals[i]
+		}
+		if err := dataRows.Scan(ptrs...); err != nil {
+			return err
+		}
+		row := make([]string, nCols)
+		for i, v := range vals {
+			switch t := v.(type) {
+			case nil:
+				row[i] = ""
+			case []byte:
+				row[i] = string(t)
+			default:
+				row[i] = fmt.Sprintf("%v", t)
+			}
+		}
+		out.Rows = append(out.Rows, row)
+	}
+	if out.Rows == nil {
+		out.Rows = [][]string{}
+	}
+	return nil
+}
+
+// duckPreviewResult is used to unmarshal the Python subprocess output.
+type duckPreviewResult struct {
+	Columns  []previewColumn `json:"columns"`
+	Rows     [][]string      `json:"rows"`
+	TotalRows int64          `json:"total_rows"`
+}
+
+// previewDuckDB fetches schema + rows from a DuckDB database via Python subprocess.
+func previewDuckDB(path, table string, limit, offset int, out *previewResponse) error {
+	pyBin := "/home/lucas/fn_registry/python/.venv/bin/python3"
+	script := fmt.Sprintf(
+		`import duckdb, json, sys
+path, table, lim, off = %q, %q, %d, %d
+c = duckdb.connect(path, read_only=True)
+cols = c.execute(f"DESCRIBE \"{table}\"").fetchall()
+cols_json = [{"name": r[0], "type": r[1]} for r in cols]
+rows = c.execute(f"SELECT * FROM \"{table}\" LIMIT {lim} OFFSET {off}").fetchall()
+rows_str = [[str(v) if v is not None else "" for v in r] for r in rows]
+total = c.execute(f"SELECT count(*) FROM \"{table}\"").fetchone()[0]
+print(json.dumps({"columns": cols_json, "rows": rows_str, "total_rows": total}))
+`, path, table, limit, offset)
+
+	cmd := exec.Command(pyBin, "-c", script)
+	rawOut, err := cmd.Output()
+	if err != nil {
+		// Capture stderr for better error messages.
+		if ee, ok := err.(*exec.ExitError); ok {
+			return fmt.Errorf("python subprocess: %w: %s", err, string(ee.Stderr))
+		}
+		return fmt.Errorf("python subprocess: %w", err)
+	}
+
+	var result duckPreviewResult
+	if err := json.Unmarshal(rawOut, &result); err != nil {
+		return fmt.Errorf("parse subprocess output: %w", err)
+	}
+	out.Columns = result.Columns
+	out.TotalRows = result.TotalRows
+	out.Rows = result.Rows
+	if out.Rows == nil {
+		out.Rows = [][]string{}
+	}
+	return nil
+}
+
+func (s *Server) handleDataFactoryTables(w http.ResponseWriter, r *http.Request) {
+	db, err := s.dataFactoryDB()
+	if err != nil {
+		writeError(w, http.StatusServiceUnavailable, "data_factory.db unavailable: "+err.Error())
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(r.Context(), queryTimeout)
+	defer cancel()
+
+	rows, err := db.QueryContext(ctx, `
+		SELECT id, kind, label, uri FROM databases ORDER BY kind, label`)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+	defer rows.Close()
+
+	// Resolve registry root for relative URIs.
+	root := os.Getenv("FN_REGISTRY_ROOT")
+	if root == "" {
+		root = "/home/lucas/fn_registry"
+	}
+
+	out := make([]dataFactoryTable, 0, 16)
+	for rows.Next() {
+		var id, kind, label, uri string
+		if err := rows.Scan(&id, &kind, &label, &uri); err != nil {
+			continue
+		}
+		path := uri
+		if !filepath.IsAbs(path) {
+			path = filepath.Join(root, uri)
+		}
+		// Existence check.
+		if _, errStat := os.Stat(path); errStat != nil {
+			out = append(out, dataFactoryTable{
+				DatabaseID: id, DatabaseLabel: label, DatabaseKind: kind,
+				TableName: "(file not found)", Error: errStat.Error(),
+			})
+			continue
+		}
+		tables, errTables := listTablesForDatabase(kind, path)
+		if errTables != nil {
+			out = append(out, dataFactoryTable{
+				DatabaseID: id, DatabaseLabel: label, DatabaseKind: kind,
+				TableName: "(error)", Error: errTables.Error(),
+			})
+			continue
+		}
+		for _, t := range tables {
+			out = append(out, dataFactoryTable{
+				DatabaseID: id, DatabaseLabel: label, DatabaseKind: kind,
+				TableName: t.Name, RowCount: t.RowCount,
+			})
+		}
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"tables": out, "count": len(out)})
+}
diff --git a/handlers_functions.go b/handlers_functions.go
new file mode 100644
index 0000000..ff3207b
--- /dev/null
+++ b/handlers_functions.go
@@ -0,0 +1,132 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sync"
+)
+
+var (
+	registryDBOnce sync.Once
+	registryDBConn *sql.DB
+	registryDBErr  error
+)
+
+func resolveRegistryDBPath() string {
+	if p := os.Getenv("FN_REGISTRY_DB"); p != "" {
+		return p
+	}
+	if root := os.Getenv("FN_REGISTRY_ROOT"); root != "" {
+		return filepath.Join(root, "registry.db")
+	}
+	return "/home/lucas/fn_registry/registry.db"
+}
+
+func openRegistryDB() (*sql.DB, error) {
+	registryDBOnce.Do(func() {
+		path := resolveRegistryDBPath()
+		// Read-only access — registry.db es source of truth gestionada via `fn index`.
+		db, err := sql.Open("sqlite3", "file:"+path+"?mode=ro&_query_only=1")
+		if err != nil {
+			registryDBErr = err
+			return
+		}
+		registryDBConn = db
+	})
+	return registryDBConn, registryDBErr
+}
+
+func (s *Server) handleFunctionByID(w http.ResponseWriter, r *http.Request) {
+	id := r.PathValue("id")
+	if id == "" {
+		writeError(w, http.StatusBadRequest, "id is required")
+		return
+	}
+
+	db, err := openRegistryDB()
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(r.Context(), queryTimeout)
+	defer cancel()
+
+	// Try functions table first.
+	const fnQuery = `SELECT id, name, kind, lang, domain, version, purity, signature,
+		description, tags, returns, returns_optional, error_type, file_path, code, documentation
+		FROM functions WHERE id = ?`
+	var (
+		fnID, name, kind, lang, domain, version, purity, signature string
+		description, tags, returns, errorType, filePath            string
+		code, documentation                                        string
+		returnsOptional                                            bool
+	)
+	err = db.QueryRowContext(ctx, fnQuery, id).Scan(
+		&fnID, &name, &kind, &lang, &domain, &version, &purity, &signature,
+		&description, &tags, &returns, &returnsOptional, &errorType, &filePath,
+		&code, &documentation,
+	)
+	if err == nil {
+		writeJSON(w, http.StatusOK, map[string]any{
+			"entity":           "function",
+			"id":               fnID,
+			"name":             name,
+			"kind":             kind,
+			"lang":             lang,
+			"domain":           domain,
+			"version":          version,
+			"purity":           purity,
+			"signature":        signature,
+			"description":      description,
+			"tags":             tags,
+			"returns":          returns,
+			"returns_optional": returnsOptional,
+			"error_type":       errorType,
+			"file_path":        filePath,
+			"code":             code,
+			"documentation":    documentation,
+		})
+		return
+	}
+	if err != sql.ErrNoRows {
+		writeError(w, http.StatusInternalServerError, err.Error())
+		return
+	}
+
+	// Fallback: types table.
+	const typeQuery = `SELECT id, name, lang, domain, version, description, tags, definition, file_path
+		FROM types WHERE id = ?`
+	var (
+		tID, tName, tLang, tDomain, tVersion string
+		tDescription, tTags, tDefinition     string
+		tFilePath                            string
+	)
+	err = db.QueryRowContext(ctx, typeQuery, id).Scan(
+		&tID, &tName, &tLang, &tDomain, &tVersion,
+		&tDescription, &tTags, &tDefinition, &tFilePath,
+	)
+	if err == nil {
+		writeJSON(w, http.StatusOK, map[string]any{
+			"entity":      "type",
+			"id":          tID,
+			"name":        tName,
+			"lang":        tLang,
+			"domain":      tDomain,
+			"version":     tVersion,
+			"description": tDescription,
+			"tags":        tTags,
+			"definition":  tDefinition,
+			"file_path":   tFilePath,
+		})
+		return
+	}
+	if err == sql.ErrNoRows {
+		writeError(w, http.StatusNotFound, "not_found")
+		return
+	}
+	writeError(w, http.StatusInternalServerError, err.Error())
+}