v0.3.1 - Implement database location and extension changes

- Change database extension from .nrdb to .db for standard SQLite convention
- Modify make_and_restart_relay.sh to run executable from build/ directory
- Database files now created in build/ directory alongside executable
- Enhanced --preserve-database flag with backup/restore functionality
- Updated source code references in config.c and main.c
- Port auto-increment functionality remains fully functional

make_and_restart_relay.sh

@@ -38,7 +38,7 @@ if [ "$HELP" = true ]; then
     echo "Event-Based Configuration:"
     echo "  This relay now uses event-based configuration stored directly in the database."
     echo "  On first startup, keys are automatically generated and printed once."
-    echo "  Database file: <relay_pubkey>.nrdb (created automatically)"
+    echo "  Database file: <relay_pubkey>.db (created automatically)"
     echo ""
     echo "Examples:"
     echo "  $0                       # Fresh start with new keys (default)"
@@ -51,15 +51,22 @@ fi
 
 # Handle database file cleanup for fresh start
 if [ "$PRESERVE_DATABASE" = false ]; then
-    if ls *.nrdb >/dev/null 2>&1; then
+    if ls *.db >/dev/null 2>&1 || ls build/*.db >/dev/null 2>&1; then
         echo "Removing existing database files to trigger fresh key generation..."
-        rm -f *.nrdb
+        rm -f *.db build/*.db
         echo "✓ Database files removed - will generate new keys and database"
     else
         echo "No existing database found - will generate fresh setup"
     fi
 else
     echo "Preserving existing database files as requested"
+    # Back up database files before clean build
+    if ls build/*.db >/dev/null 2>&1; then
+        echo "Backing up existing database files..."
+        mkdir -p /tmp/relay_backup_$$
+        cp build/*.db* /tmp/relay_backup_$$/ 2>/dev/null || true
+        echo "Database files backed up to temporary location"
+    fi
 fi
 
 # Clean up legacy files that are no longer used
@@ -70,6 +77,14 @@ rm -f db/c_nostr_relay.db* 2>/dev/null
 echo "Building project..."
 make clean all
 
+# Restore database files if preserving
+if [ "$PRESERVE_DATABASE" = true ] && [ -d "/tmp/relay_backup_$$" ]; then
+    echo "Restoring preserved database files..."
+    cp /tmp/relay_backup_$$/*.db* build/ 2>/dev/null || true
+    rm -rf /tmp/relay_backup_$$
+    echo "Database files restored to build directory"
+fi
+
 # Check if build was successful
 if [ $? -ne 0 ]; then
     echo "ERROR: Build failed. Cannot restart relay."
@@ -129,9 +144,13 @@ echo "Database will be initialized automatically on startup if needed"
 echo "Starting relay server..."
 echo "Debug: Current processes: $(ps aux | grep 'c_relay_' | grep -v grep || echo 'None')"
 
+# Change to build directory before starting relay so database files are created there
+cd build
 # Start relay in background and capture its PID (no command line arguments needed)
-$BINARY_PATH > relay.log 2>&1 &
+./$(basename $BINARY_PATH) > ../relay.log 2>&1 &
 RELAY_PID=$!
+# Change back to original directory
+cd ..
 
 echo "Started with PID: $RELAY_PID"