Added switch and some more endpoints to support installation script.

src/main/java/nl/andrewl/railsignalapi/model/Switch.java

@@ -0,0 +1,30 @@
+package nl.andrewl.railsignalapi.model;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.*;
+
+@Entity
+@Getter
+@NoArgsConstructor
+public class Switch {
+	@Id
+	@GeneratedValue
+	private Long id;
+
+	@ManyToOne(optional = false, fetch = FetchType.LAZY)
+	private RailSystem railSystem;
+
+	@Column(nullable = false)
+	private String name;
+
+	@Embedded
+	private Position position;
+
+	@Column(nullable = false)
+	private int state;
+
+	@Column(nullable = false)
+	private int maxStates;
+}

src/main/java/nl/andrewl/railsignalapi/rest/RailSystemsApiController.java

@@ -25,6 +25,11 @@ public class RailSystemsApiController {
 		return railSystemService.createRailSystem(payload);
 	}
 
+	@GetMapping(path = "/{rsId}")
+	public RailSystemResponse getRailSystem(@PathVariable long rsId) {
+		return railSystemService.getRailSystem(rsId);
+	}
+
 	@DeleteMapping(path = "/{rsId}")
 	public ResponseEntity<?> deleteRailSystem(@PathVariable long rsId) {
 		railSystemService.delete(rsId);

src/main/java/nl/andrewl/railsignalapi/rest/StatusController.java

@@ -0,0 +1,17 @@
+package nl.andrewl.railsignalapi.rest;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+
+@RestController
+@RequestMapping(path = "/api/status")
+public class StatusController {
+
+	@GetMapping
+	public Map<String, Object> getStatus() {
+		return Map.of("status", "online");
+	}
+}

src/main/java/nl/andrewl/railsignalapi/service/RailSystemService.java

@@ -46,4 +46,11 @@ public class RailSystemService {
 		branchRepository.deleteAll(branches);
 		railSystemRepository.delete(rs);
 	}
+
+	@Transactional(readOnly = true)
+	public RailSystemResponse getRailSystem(long rsId) {
+		var rs = railSystemRepository.findById(rsId)
+				.orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND));
+		return new RailSystemResponse(rs);
+	}
 }