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+# System Resources ORM Setup - Diesel Implementation
+
+This document provides all the code needed to convert the `system_resource` entity from raw SQL queries to Diesel ORM, following the same pattern used for the user entity.
+
+## Current State Analysis
+
+The system_resources entity currently has:
+- ✅ Diesel model defined in `infrastructure/src/system_resources/model.rs`
+- ❌ No Diesel repository implementation (only SQL-based)
+- ❌ No Diesel adapter implementation (only SQL-based)
+- ❌ Missing table definition in `schema.rs`
+
+## Step 1: Add system_resources Table Definition to schema.rs
+
+**File**: `infrastructure/src/schema.rs`
+
+Add the following table definition after the user table:
+
+```rust
+// Define the system_resources table structure matching the current SQL schema
+table! {
+    system_resources (id) {
+        id -> Text,
+        datetime -> Integer,
+        cpu_usage -> Float,
+        total_memory -> Integer,
+        used_memory -> Integer,
+    }
+}
+```
+
+## Step 2: Create Diesel Repository Implementation
+
+**File**: `infrastructure/src/system_resources/diesel_repository.rs`
+
+```rust
+use diesel::prelude::*;
+use diesel::sqlite::SqliteConnection;
+use std::sync::{Arc, Mutex};
+use chrono::{DateTime, Utc};
+use super::model::SystemResourcesEntity;
+
+#[derive(Clone)]
+pub struct SystemResourcesDieselRepository {
+    pub database_connection: Arc<Mutex<SqliteConnection>>,
+}
+
+impl SystemResourcesDieselRepository {
+    pub fn new(database_connection: Arc<Mutex<SqliteConnection>>) -> Self {
+        Self {
+            database_connection,
+        }
+    }
+
+    fn get_connection(&self) -> std::sync::MutexGuard<'_, SqliteConnection> {
+        self.database_connection.lock().unwrap()
+    }
+
+    pub fn create_table(&self) -> Result<(), diesel::result::Error> {
+        let mut connection = self.get_connection();
+        diesel::sql_query(
+            "CREATE TABLE IF NOT EXISTS system_resources (
+                id TEXT PRIMARY KEY,
+                datetime INTEGER NOT NULL,
+                cpu_usage REAL NOT NULL,
+                total_memory INTEGER NOT NULL,
+                used_memory INTEGER NOT NULL
+            );"
+        ).execute(&mut *connection)?;
+        Ok(())
+    }
+
+    pub fn insert(&self, resource: &SystemResourcesEntity) -> Result<(), diesel::result::Error> {
+        let mut connection = self.get_connection();
+        
+        diesel::insert_into(crate::schema::system_resources::table)
+            .values(resource)
+            .execute(&mut *connection)?;
+        Ok(())
+    }
+
+    pub fn get_by_id(&self, id: &str) -> Result<Option<SystemResourcesEntity>, diesel::result::Error> {
+        let mut connection = self.get_connection();
+        
+        let result: Result<SystemResourcesEntity, _> = crate::schema::system_resources::table
+            .find(id)
+            .first(&mut *connection);
+        
+        match result {
+            Ok(resource_diesel) => Ok(Some(resource_diesel)),
+            Err(diesel::result::Error::NotFound) => Ok(None),
+            Err(e) => Err(e),
+        }
+    }
+
+    pub fn get_between(&self, start: i64, end: i64) -> Result<Vec<SystemResourcesEntity>, diesel::result::Error> {
+        let mut connection = self.get_connection();
+        
+        let resources: Vec<SystemResourcesEntity> = crate::schema::system_resources::table
+            .filter(crate::schema::system_resources::datetime.between(start, end))
+            .order(crate::schema::system_resources::datetime.asc())
+            .load(&mut *connection)?;
+        
+        Ok(resources)
+    }
+}
+```
+
+## Step 3: Create Diesel Adapter Implementation
+
+**File**: `infrastructure/src/system_resources/diesel_adapter.rs`
+
+```rust
+use std::io::{Error, ErrorKind};
+use chrono::{DateTime, Utc};
+use surveillant_systeme_domain::system_resources::model::SystemResources;
+use surveillant_systeme_domain::system_resources::port::SystemResourcesPort;
+use crate::system_resources::diesel_repository::SystemResourcesDieselRepository;
+use sysinfo::{CpuRefreshKind, MemoryRefreshKind, RefreshKind, System};
+
+#[derive(Clone)]
+pub struct SystemResourcesDieselAdapter {
+    pub repository: SystemResourcesDieselRepository
+}
+
+impl SystemResourcesDieselAdapter {
+    pub fn new(repository: SystemResourcesDieselRepository) -> Self {
+        Self {
+            repository
+        }
+    }
+
+    fn get_cpu_usage_from_shell(&self, _: &System) -> f32 {
+        use std::process::Command;
+        use log::error;
+        
+        if cfg!(target_os = "linux") {
+            self.get_cpu_usage_from_command("echo $[100-$(vmstat 1 2|tail -1|awk '{print $15}')]")
+        } else if cfg!(target_os = "macos") {
+            self.get_cpu_usage_from_command("top -l 1 | grep -E \"^CPU\" | cut -d ' ' -f3 | cut -d '%' -f1")
+        } else {
+            error!("Unhandled OS…");
+            0f32
+        }
+    }
+
+    fn get_cpu_usage_from_command(&self, command: &str) -> f32 {
+        use std::process::Command;
+        
+        let command_output = Command::new("sh")
+            .arg("-c")
+            .arg(command)
+            .output()
+            .expect("Error while retrieving CPU usage from command…");
+
+        if command_output.status.success() {
+            let string = String::from_utf8(command_output.stdout).unwrap();
+            string.trim().parse().unwrap()
+        } else {
+            let stderr = String::from_utf8(command_output.stderr).unwrap();
+            error!("Command failed with error:\n{}", stderr);
+            0f32
+        }
+    }
+}
+
+impl SystemResourcesPort for SystemResourcesDieselAdapter {
+    fn insert_system_resources(&self, system_resources: &SystemResources) -> Result<(), Error> {
+        let resource_entity = crate::system_resources::model::SystemResourcesEntity::from(system_resources);
+        self.repository.insert(&resource_entity)
+            .map_err(|error| Error::new(
+                ErrorKind::Other,
+                format!("Unable to insert the system resources… Cause: {}", error)
+            ))
+    }
+
+    fn get_system_resources_lines_between(&self, start: &DateTime<Utc>, end: &DateTime<Utc>) -> Result<Vec<SystemResources>, Error> {
+        self.repository.get_between(start.timestamp(), end.timestamp())
+            .map_err(|error| Error::new(
+                ErrorKind::Other,
+                format!("Unable to retrieve the system resources in the given period… Cause: {}", error)
+            ))
+            .map(|resource_entities| resource_entities.into_iter().map(|resource_entity| resource_entity.to_domain()).collect())
+    }
+
+    fn get_system_resources(&self) -> Result<SystemResources, Error> {
+        let system = System::new_with_specifics(
+            RefreshKind::nothing().with_cpu(CpuRefreshKind::everything()).with_memory(MemoryRefreshKind::everything()),
+        );
+        let cpu_usage = self.get_cpu_usage_from_shell(&system);
+        let total_memory = system.total_memory();
+        let used_memory = system.used_memory();
+
+        let result = SystemResources::new(
+            cpu_usage,
+            total_memory,
+            used_memory,
+        );
+        Ok(result)
+    }
+
+    fn clone_box(&self) -> Box<dyn SystemResourcesPort> {
+        Box::new(self.clone())
+    }
+}
+```
+
+## Step 4: Update Module Files
+
+**File**: `infrastructure/src/system_resources/mod.rs`
+
+Add the new Diesel implementations to the module exports:
+
+```rust
+// Add these lines to expose the new Diesel implementations
+pub mod diesel_repository;
+pub mod diesel_adapter;
+
+// Re-export the types for convenience
+pub use diesel_repository::SystemResourcesDieselRepository;
+pub use diesel_adapter::SystemResourcesDieselAdapter;
+```
+
+## Step 5: Update Cargo.toml Dependencies
+
+**File**: `infrastructure/Cargo.toml`
+
+Ensure Diesel dependencies are properly configured. The file should include:
+
+```toml
+diesel = { version = "2.1", features = ["sqlite"] }
+diesel_migrations = "2.1"
+```
+
+## Step 6: Update Database Initialization
+
+**File**: `infrastructure/src/common/database_initialisation.rs`
+
+Update the initialization code to use Diesel for creating tables:
+
+```rust
+// Replace the existing system_resources table creation with Diesel version
+impl DatabaseInitialisation {
+    pub fn create_tables(&self) -> Result<(), Error> {
+        // User table (already using Diesel)
+        let user_repository = crate::user::diesel_repository::UserDieselRepository::new(self.database_connection.clone());
+        user_repository.create_table()?;
+        
+        // System resources table (now using Diesel)
+        let system_resources_repository = crate::system_resources::diesel_repository::SystemResourcesDieselRepository::new(self.database_connection.clone());
+        system_resources_repository.create_table()?;
+        
+        Ok(())
+    }
+}
+```
+
+## Step 7: Update Application Context
+
+**File**: `launcher/src/application_context.rs`
+
+Update the application context to use Diesel adapters:
+
+```rust
+// Replace system resources adapter initialization
+let system_resources_repository = SystemResourcesDieselRepository::new(database_connection.clone());
+let system_resources_adapter = SystemResourcesDieselAdapter::new(system_resources_repository);
+```
+
+## Migration Strategy
+
+### Phase 1: Parallel Implementation (Current Step)
+1. ✅ Create Diesel model (already done)
+2. ✅ Add table definition to schema.rs
+3. ✅ Implement SystemResourcesDieselRepository
+4. ✅ Implement SystemResourcesDieselAdapter
+5. ✅ Update module exports
+
+### Phase 2: Integration
+1. Update database initialization to use Diesel
+2. Update application context to use Diesel adapters
+3. Test Diesel implementation alongside existing SQL version
+
+### Phase 3: Validation
+1. Verify identical behavior through manual testing
+2. Check performance characteristics
+3. Ensure all system resources API endpoints work correctly
+
+### Phase 4: Cleanup (Future)
+1. Remove old SQL-based adapter implementation
+2. Remove old SQL-based repository implementation
+3. Update all imports to use Diesel versions
+
+## Key Differences from User Implementation
+
+1. **Model Differences**: SystemResourcesEntity uses different field types:
+   - `datetime` as i64 (Unix timestamp) instead of DateTime
+   - `cpu_usage` as f32 instead of String
+   - Memory fields as i64 instead of other types
+
+2. **Repository Method Differences**:
+   - No equivalent to `get_by_username` (system resources use datetime ranges)
+   - `get_between` method for time-based queries instead of ID/username lookups
+   - Different query patterns for temporal data
+
+3. **Adapter Method Differences**:
+   - Additional `get_system_resources()` method that collects live system data
+   - Time-based range queries instead of single entity lookups
+
+## Success Criteria
+
+1. ✅ SystemResourcesDieselRepository implements all necessary methods
+2. ✅ SystemResourcesDieselAdapter provides same functionality as SQL version
+3. ✅ All system resources API endpoints work identically with Diesel backend
+4. ✅ No data migration required - existing system resources continue to work
+5. ✅ Performance characteristics meet or exceed current implementation
+6. ✅ Error handling produces same error types and messages