fc-common: add build_metrics table and repository

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: If6842311f49bfcba9e1b11fa8bc9748c6a6a6964

crates/common/migrations/012_build_metrics.sql

@@ -0,0 +1,45 @@
+-- Migration: Add build metrics collection
+-- Stores timing, size, and performance metrics for builds
+
+-- Create build_metrics table
+CREATE TABLE build_metrics (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    build_id UUID NOT NULL REFERENCES builds(id) ON DELETE CASCADE,
+    metric_name VARCHAR(100) NOT NULL,
+    metric_value DOUBLE PRECISION NOT NULL,
+    unit VARCHAR(50) NOT NULL,
+    collected_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
+);
+
+-- Index for efficient lookups by build
+CREATE INDEX idx_build_metrics_build_id ON build_metrics(build_id);
+
+-- Index for time-based queries (alerting)
+CREATE INDEX idx_build_metrics_collected_at ON build_metrics(collected_at);
+
+-- Index for metric name filtering
+CREATE INDEX idx_build_metrics_name ON build_metrics(metric_name);
+
+-- Prevent duplicate metrics for same build+name
+ALTER TABLE build_metrics ADD CONSTRAINT unique_build_metric_name UNIQUE (build_id, metric_name);
+
+-- Create view for aggregate build statistics
+CREATE VIEW build_metrics_summary AS
+SELECT
+    b.id as build_id,
+    b.job_name,
+    b.status,
+    b.system,
+    e.jobset_id,
+    j.project_id,
+    b.started_at,
+    b.completed_at,
+    EXTRACT(EPOCH FROM (b.completed_at - b.started_at)) as duration_seconds,
+    MAX(CASE WHEN bm.metric_name = 'output_size_bytes' THEN bm.metric_value END) as output_size_bytes,
+    MAX(CASE WHEN bm.metric_name = 'peak_memory_bytes' THEN bm.metric_value END) as peak_memory_bytes,
+    MAX(CASE WHEN bm.metric_name = 'nar_size_bytes' THEN bm.metric_value END) as nar_size_bytes
+FROM builds b
+JOIN evaluations e ON b.evaluation_id = e.id
+JOIN jobsets j ON e.jobset_id = j.id
+LEFT JOIN build_metrics bm ON b.id = bm.build_id
+GROUP BY b.id, b.job_name, b.status, b.system, e.jobset_id, j.project_id, b.started_at, b.completed_at;