feat: Add comprehensive test suite and cleanup step

- Split validation into 4 granular CI steps (Config, Timescale, Vector, Hybrid)
- Added cleanup step for Docker images in CI
- Created SQL test scripts in tests/ for robustness

tests/test-1-config.sql

@@ -0,0 +1,17 @@
+-- Test 1: Configuration
+\set ON_ERROR_STOP on
+
+SELECT version();
+SELECT extname, extversion FROM pg_extension;
+
+DO $$
+DECLARE
+    preload_libs text;
+BEGIN
+    SELECT setting INTO preload_libs FROM pg_settings WHERE name = 'shared_preload_libraries';
+    IF preload_libs NOT LIKE '%timescaledb%' OR preload_libs NOT LIKE '%vchord%' THEN
+        RAISE EXCEPTION 'Missing shared_preload_libraries config. Found: %', preload_libs;
+    END IF;
+    RAISE NOTICE 'Configuration Check: OK';
+END
+$$;

tests/test-2-timescale.sql

@@ -0,0 +1,31 @@
+-- Test 2: TimescaleDB
+\set ON_ERROR_STOP on
+
+DROP TABLE IF EXISTS sensors CASCADE;
+
+CREATE TABLE sensors (
+    time TIMESTAMPTZ NOT NULL,
+    sensor_id INTEGER,
+    temperature DOUBLE PRECISION
+);
+
+-- Convert to hypertable
+SELECT create_hypertable('sensors', 'time');
+
+-- Insert data
+INSERT INTO sensors (time, sensor_id, temperature) VALUES 
+    (NOW(), 1, 20.0), 
+    (NOW() + INTERVAL '1 hour', 1, 22.0);
+
+-- Query data
+DO $$
+DECLARE
+    count int;
+BEGIN
+    SELECT count(*) INTO count FROM sensors;
+    IF count != 2 THEN
+        RAISE EXCEPTION 'Hypertable insert failed';
+    END IF;
+    RAISE NOTICE 'TimescaleDB Check: OK';
+END
+$$;

tests/test-3-vector.sql

@@ -0,0 +1,27 @@
+-- Test 3: VectorChord / pgvector
+\set ON_ERROR_STOP on
+
+DROP TABLE IF EXISTS items;
+
+CREATE TABLE items (
+    id bigserial PRIMARY KEY, 
+    embedding vector(3)
+);
+
+INSERT INTO items (embedding) VALUES ('[1,2,3]'), ('[4,5,6]'), ('[1.1, 2.1, 3.1]');
+
+-- Create VectorChord Index
+CREATE INDEX ON items USING vchordrq (embedding vector_l2_ops);
+
+-- Search
+DO $$
+DECLARE
+    closest_id int;
+BEGIN
+    SELECT id INTO closest_id FROM items ORDER BY embedding <-> '[1,2,3]' LIMIT 1;
+    IF closest_id != 1 THEN
+        RAISE EXCEPTION 'Vector search failed. Expected ID 1, got %', closest_id;
+    END IF;
+    RAISE NOTICE 'Vector Check: OK';
+END
+$$;

tests/test-4-hybrid.sql

@@ -0,0 +1,40 @@
+-- Test 4: Hybrid (Timescale + Vector)
+\set ON_ERROR_STOP on
+
+DROP TABLE IF EXISTS hybrid_logs;
+
+CREATE TABLE hybrid_logs (
+    time TIMESTAMPTZ NOT NULL,
+    msg TEXT,
+    vec vector(2)
+);
+
+SELECT create_hypertable('hybrid_logs', 'time');
+
+INSERT INTO hybrid_logs (time, msg, vec) VALUES
+    (NOW(), 'log1', '[0,0]'),
+    (NOW() - INTERVAL '1 day', 'old_log', '[1,1]');
+
+-- Index
+CREATE INDEX ON hybrid_logs USING vchordrq (vec vector_l2_ops);
+
+-- Hybrid Query
+DO $$
+DECLARE
+    res_count int;
+BEGIN
+    -- Recent logs similar to [0.1, 0.1]
+    SELECT count(*) INTO res_count 
+    FROM (
+        SELECT * FROM hybrid_logs 
+        WHERE time > NOW() - INTERVAL '1 hour'
+        ORDER BY vec <-> '[0.1, 0.1]'
+        LIMIT 1
+    ) sub;
+
+    IF res_count != 1 THEN
+        RAISE EXCEPTION 'Hybrid query failed';
+    END IF;
+    RAISE NOTICE 'Hybrid Check: OK';
+END
+$$;