Switch backend to wait for SQL Server and use direct INSERTs

Replace stored procedure calls with inline INSERT statements and
SCOPE_IDENTITY()
Add netcat for readiness check in new entrypoint.sh
Introduce dedicated SQL Server and init-db services in docker-compose

db/Dockerfile

@@ -0,0 +1,27 @@
+# Dockerfile for DB init service
+
+FROM mcr.microsoft.com/mssql/server:2022-latest
+
+# Set SQL Server environment variables
+ENV SA_PASSWORD=Ou812@12!@ \
+    ACCEPT_EULA=Y
+
+# Set working directory inside the container
+WORKDIR /usr/src/app
+
+# Copy the initialization script and SQL file into the image
+COPY --chmod=0755 init.sh .
+COPY init.sql .
+
+# Make the script executable
+
+
+# Start SQL Server, wait until it is ready, then run the init script
+CMD /opt/mssql/bin/sqlservr & \
+    /bin/bash -c "\
+    until /opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P $$SA_PASSWORD -Q \"SELECT 1\" >/dev/null 2>&1; do \
+    sleep 1; \
+    done && \
+    ./init.sh && \
+    tail -f /dev/null \
+    "