Add backup and restore scripts for migrating user data between PCs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/backup-data.sh

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+#!/bin/bash
+# Backs up user data to a timestamped zip file you can copy to your new PC.
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+APP_DIR="$(dirname "$SCRIPT_DIR")"
+DB_FILE="$APP_DIR/server/data/projects.db"
+TIMESTAMP=$(date +"%Y%m%d_%H%M%S")
+BACKUP_FILE="$APP_DIR/study-app-backup_$TIMESTAMP.zip"
+
+if [ ! -f "$DB_FILE" ]; then
+  echo "ERROR: Database not found at $DB_FILE"
+  exit 1
+fi
+
+zip -j "$BACKUP_FILE" "$DB_FILE"
+
+echo ""
+echo "Backup created: $BACKUP_FILE"
+echo ""
+echo "Copy this file to your new PC, then run:"
+echo "  scripts/restore-data.sh <path-to-backup-file>"

scripts/restore-data.sh

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+#!/bin/bash
+# Restores user data from a backup zip created by backup-data.sh.
+# Usage: scripts/restore-data.sh <path-to-backup-file>
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+APP_DIR="$(dirname "$SCRIPT_DIR")"
+DATA_DIR="$APP_DIR/server/data"
+BACKUP_FILE="$1"
+
+if [ -z "$BACKUP_FILE" ]; then
+  echo "Usage: scripts/restore-data.sh <path-to-backup-file>"
+  exit 1
+fi
+
+if [ ! -f "$BACKUP_FILE" ]; then
+  echo "ERROR: Backup file not found: $BACKUP_FILE"
+  exit 1
+fi
+
+mkdir -p "$DATA_DIR"
+
+# Warn if a database already exists
+if [ -f "$DATA_DIR/projects.db" ]; then
+  echo "WARNING: An existing database was found at $DATA_DIR/projects.db"
+  read -p "Overwrite it? (y/N): " CONFIRM
+  if [[ "$CONFIRM" != "y" && "$CONFIRM" != "Y" ]]; then
+    echo "Restore cancelled."
+    exit 0
+  fi
+  cp "$DATA_DIR/projects.db" "$DATA_DIR/projects.db.bak"
+  echo "Old database backed up to projects.db.bak"
+fi
+
+unzip -o "$BACKUP_FILE" -d "$DATA_DIR"
+
+echo ""
+echo "Restore complete. Database is at: $DATA_DIR/projects.db"
+echo "You can now start the app normally."