Webapp

src/index_key.rs

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+use crate::metric_primitive::MetricPrimitive;
+use crate::timestamp::Timestamp;
+use serde::Serialize;
+use std::collections::BTreeMap;
+
+/// Key type for the engine's primary index.
+///
+/// Variants are ordered top to bottom as declared (derived `Ord` compares the
+/// discriminant first), which is what carves the map into contiguous ranges:
+/// logs, then params, then metric declarations, then buckets.
+#[allow(dead_code)]
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Serialize)]
+pub enum IndexKey {
+    /// Marker for the start of the whole range. Never inserted, only navigated to.
+    Start,
+    IngestedLog {
+        sequence: u64,
+        timestamp: Timestamp,
+    },
+    /// Marker between the log range and the param range.
+    LogParamSplit,
+    ParamDeclaration {
+        name: String,
+    },
+    /// Marker between the param range and the metric declaration range.
+    ParamMetricSplit,
+    MetricDeclaration {
+        name: String,
+    },
+    /// Marker between metric declarations and their buckets.
+    MetricBucketSplit,
+    Bucket {
+        metric_name: String,
+        labels: BTreeMap<String, MetricPrimitive>,
+    },
+    /// Marker for the end of the whole range. Nothing sorts after this.
+    End,
+}