build: Improve caching (#681)

* move regenerate_sqlx_cache.sh to dev-scripts

* helix ignore src-tauri/gen

* delete old regenerate_sqlx_cache

* build monero c++ dependencies in target/debug/monero-depends to avoid rebuilding

* add sccache rustc wrapper

* install sccache in ci

* key cache by target as well

* remove sccache

dev-scripts/regenerate_sqlx_cache.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+# regenerate_sqlx_cache.sh
+#
+# Script to regenerate SQLx query cache for monero-rpc-pool
+#
+# This script:
+# 1. Creates a temporary SQLite database in the workspace root
+# 2. Runs all database migrations to set up the schema
+# 3. Regenerates the SQLx query cache (.sqlx directory)
+# 4. Cleans up temporary database file automatically
+#
+# Usage:
+#   ./regenerate_sqlx_cache.sh
+#
+# Requirements:
+# - cargo and sqlx-cli must be installed
+# - Must be run from the monero-rpc-pool directory
+# - migrations/ directory must exist with valid migration files
+#
+# The generated .sqlx directory should be committed to version control
+# to enable offline compilation without requiring DATABASE_URL.
+
+set -e  # Exit on any error
+
+echo "🔄 Regenerating SQLx query cache..."
+
+WORKSPACE_ROOT="$PWD"
+
+# Use shared temporary database in workspace root
+TEMP_DB="$WORKSPACE_ROOT/tempdb.sqlite"
+DATABASE_URL="sqlite:$TEMP_DB"
+
+rm -f "$TEMP_DB"
+
+echo "📁 Using temporary database: $TEMP_DB"
+
+# Export DATABASE_URL for sqlx commands
+export DATABASE_URL
+
+echo "🗄️  Creating database..."
+cargo sqlx database create
+
+for dir in swap monero-sys monero-rpc-pool; do
+    echo "🔄 Running migrations in $dir..."
+    (cd "$WORKSPACE_ROOT/$dir" && rm -rf .sqlx && cargo sqlx migrate run --ignore-missing)
+done
+
+echo "⚡ Preparing SQLx query cache..."
+cargo sqlx prepare --workspace
+
+echo "✅ SQLx query cache regenerated successfully!"
+echo "📝 The .sqlx directory has been updated with the latest query metadata."
+echo "💡 Make sure to commit the .sqlx directory to version control."