chore(compose): add docker-compose.yml

db/init.sql

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+-- TimescaleDB hypertable for time-series audio metrics
+
+-- Enable TimescaleDB extension
+CREATE EXTENSION IF NOT EXISTS timescaledb;
+
+-- Create audio data table
+CREATE TABLE IF NOT EXISTS audio_data (
+    time TIMESTAMPTZ NOT NULL,
+    rms_db REAL CHECK (rms_db >= -40.0 AND rms_db <= 80.0),
+    frequency_hz INTEGER CHECK (frequency_hz >= 100 AND frequency_hz <= 8000),
+    is_silence BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+-- Convert to hypertable (time-series optimization)
+SELECT create_hypertable('audio_data', 'time', if_not_exists => TRUE);
+
+-- Create index for frequency queries (exclude silence for performance)
+CREATE INDEX IF NOT EXISTS idx_frequency 
+    ON audio_data(frequency_hz) 
+    WHERE NOT is_silence;
+
+-- Create index for time-based queries
+CREATE INDEX IF NOT EXISTS idx_time_desc 
+    ON audio_data(time DESC);
+
+-- Optional: Create continuous aggregate for 1-minute averages
+CREATE MATERIALIZED VIEW IF NOT EXISTS audio_data_1min
+WITH (timescaledb.continuous) AS
+SELECT 
+    time_bucket('1 minute', time) AS bucket,
+    AVG(rms_db) AS avg_rms_db,
+    MAX(rms_db) AS max_rms_db,
+    MIN(rms_db) AS min_rms_db,
+    mode() WITHIN GROUP (ORDER BY frequency_hz) AS dominant_freq_hz,
+    SUM(CASE WHEN is_silence THEN 1 ELSE 0 END)::REAL / COUNT(*) AS silence_ratio
+FROM audio_data
+GROUP BY bucket
+WITH NO DATA;
+
+-- Refresh policy: update aggregate every 5 minutes
+SELECT add_continuous_aggregate_policy('audio_data_1min',
+    start_offset => INTERVAL '1 hour',
+    end_offset => INTERVAL '1 minute',
+    schedule_interval => INTERVAL '5 minutes',
+    if_not_exists => TRUE
+);
+
+-- Data retention: keep raw data for 7 days
+SELECT add_retention_policy('audio_data', 
+    INTERVAL '7 days',
+    if_not_exists => TRUE
+);
+
+-- Grant permissions
+GRANT ALL ON audio_data TO postgres;
+GRANT SELECT ON audio_data_1min TO postgres;