fix: resolve PostgreSQL type mismatches and add willexecutor debug logging

- Fix get_next_address_index: use try_get::<i32> for PG SERIAL/INTEGER columns
- Fix search_tx: use try_get::<i32> for PG status column
- Fix execute_insert: parse locktime (String→i64) and in_vout (String→i32)
  before binding to PG INTEGER columns
- Fix execute_insert: bind tbl_out vout as i32, amount as String for PG
- Fix save_new_address: cast xpub i64 to i32 for PG INTEGER column
- Fix get_pending_txs: cast i64 bind params to i32, use try_get::<i32> for reads
- Fix get_stats: use try_get::<i32> for all numeric PG INTEGER columns
- Add trace logging in parse_request_transactions for xpub address matching
- Add trace logging in get_all_addresses_by_xpub for query debugging

tbitcoind.service

@@ -0,0 +1,55 @@
+# /etc/systemd/system/tbitcoind.service
+
+[Unit]
+Description=Bitcoin Testnet daemon
+After=network.target
+
+[Service]
+
+# Service execution
+###################
+
+ExecStart=/usr/local/bin/bitcoind -daemon -testnet \
+                                  -pid=/run/tbitcoind/tbitcoind.pid \
+                                  -conf=/home/bitcoin/.bitcoin/bitcoin.conf \
+                                  -datadir=/home/bitcoin/.bitcoin \
+                                  -startupnotify="chmod g+r /home/bitcoin/.bitcoin/testnet3/.cookie"
+
+# Process management
+####################
+Type=forking
+PIDFile=/run/tbitcoind/tbitcoind.pid
+Restart=on-failure
+TimeoutSec=300
+RestartSec=30
+
+# Directory creation and permissions
+####################################
+User=bitcoin
+UMask=0027
+
+# /run/tbitcoind
+RuntimeDirectory=tbitcoind
+RuntimeDirectoryMode=0710
+
+# Hardening measures
+####################
+# Provide a private /tmp and /var/tmp.
+PrivateTmp=true
+
+# Mount /usr, /boot/ and /etc read-only for the process.
+ProtectSystem=full
+
+# Disallow the process and all of its children to gain
+# new privileges through execve().
+NoNewPrivileges=true
+
+# Use a new /dev namespace only populated with API pseudo devices
+# such as /dev/null, /dev/zero and /dev/random.
+PrivateDevices=true
+
+# Deny the creation of writable and executable memory mappings.
+MemoryDenyWriteExecute=true
+
+[Install]
+WantedBy=multi-user.target