readme updates, fixed out of bounds exception

README.md

@@ -48,6 +48,7 @@ Ready to install? Use the [Quickstart](https://solarthing.readthedocs.io/en/late
 
 * Grafana (recommended)
   * Use SolarThing Server (with CouchDB) alongside [Wild GraphQL Data Source](https://grafana.com/grafana/plugins/retrodaredevil-wildgraphql-datasource/)
+    * Documentation: https://solarthing.readthedocs.io/en/latest/quickstart/data/solarthing-server/index.html
   * Alternatively, configure SolarThing to upload to InfluxDB for viewing of statistics in Grafana
 * [SolarThing Android](https://play.google.com/store/apps/details?id=me.retrodaredevil.solarthing.android)
   * SolarThing Android connects directly to CouchDB to display data in a persistent notification

docker/README.md

@@ -1,5 +1,12 @@
 # docker
 This directory is used to contain `Dockerfile`s to build `solarthing` and `solarthing-server` docker images.
+
+NOTE: If you are looking for documentation, go here: https://solarthing.readthedocs.io/en/latest/quickstart/install/docker.html
+
+
+
+## Technical details about this directory
+
 Note that this directory is designed to be separate from the state of a codebase at any given commit.
 Even while building docker images for older SolarThing versions,
 the latest files in this folder should be used to build those images.

server/src/main/java/me/retrodaredevil/solarthing/rest/graphql/service/SolarThingGraphQLBatteryRecordService.java

@@ -19,6 +19,7 @@
 
 import java.time.Duration;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -99,6 +100,9 @@ public SolarThingBatteryEstimate(List<IdentificationCacheDataPacket<BatteryRecor
 
 		@GraphQLQuery
 		public @NotNull List<@NotNull DataNode<Double>> queryEstimate(@GraphQLArgument(name = "ratio") double ratio) {
+			if (data.isEmpty()) {
+				return Collections.emptyList();
+			}
 			var first = data.get(0);
 			var last = data.get(data.size() - 1);