-- ============================================================================
-- Migration 051: CannaiQ Canonical Schema - Safe Bootstrap
-- ============================================================================
--
-- Purpose: Create the canonical CannaiQ schema tables from scratch.
--          This migration is FULLY IDEMPOTENT and safe to run multiple times.
--
-- SAFETY RULES FOLLOWED:
--   1. ALL tables use CREATE TABLE IF NOT EXISTS
--   2. ALL columns use ALTER TABLE ADD COLUMN IF NOT EXISTS
--   3. ALL indexes use CREATE INDEX IF NOT EXISTS
--   4. NO DROP, DELETE, TRUNCATE, or destructive operations
--   5. NO assumptions about existing data or column existence
--   6. NO dependencies on migrations 041, 043, or 050
--   7. Compatible with dutchie_menus database as it exists today
--   8. Safe handling of pre-existing states table with missing columns
--
-- Tables Created:
--   - states (US state reference table)
--   - chains (retail chain/group table)
--   - crawl_runs (crawl execution records)
--   - store_products (current menu state)
--   - store_product_snapshots (historical price/stock data)
--
-- Columns Added:
--   - dispensaries.state_id (FK to states)
--   - dispensaries.chain_id (FK to chains)
--
-- Run with:
--   psql "postgresql://dutchie:dutchie_local_pass@localhost:54320/dutchie_menus" \
--     -f migrations/051_cannaiq_canonical_safe_bootstrap.sql
--
-- ============================================================================


-- ============================================================================
-- SECTION 1: STATES TABLE
-- ============================================================================
-- Reference table for US states where CannaiQ operates.
-- This section handles the case where the table exists but is missing columns.

-- First, create the table if it doesn't exist (minimal definition)
CREATE TABLE IF NOT EXISTS states (
    id SERIAL PRIMARY KEY,
    code VARCHAR(2) NOT NULL,
    name VARCHAR(100) NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW()
);

-- Now safely add any missing columns (each is independent, won't fail if exists)
ALTER TABLE states ADD COLUMN IF NOT EXISTS timezone TEXT;
ALTER TABLE states ADD COLUMN IF NOT EXISTS is_active BOOLEAN DEFAULT TRUE;
ALTER TABLE states ADD COLUMN IF NOT EXISTS crawl_enabled BOOLEAN DEFAULT TRUE;

-- Add unique constraint on code if not exists
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'states_code_key' AND conrelid = 'states'::regclass
    ) THEN
        -- Check if there's already a unique constraint with a different name
        IF NOT EXISTS (
            SELECT 1 FROM pg_indexes
            WHERE tablename = 'states' AND indexdef LIKE '%UNIQUE%code%'
        ) THEN
            ALTER TABLE states ADD CONSTRAINT states_code_key UNIQUE (code);
        END IF;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL; -- Constraint already exists
    WHEN OTHERS THEN
        NULL; -- Handle any other errors gracefully
END $$;

-- Set default timezone values for existing rows that have NULL
UPDATE states SET timezone = 'America/Phoenix' WHERE timezone IS NULL AND code = 'AZ';
UPDATE states SET timezone = 'America/Los_Angeles' WHERE timezone IS NULL AND code IN ('CA', 'NV', 'OR', 'WA');
UPDATE states SET timezone = 'America/Denver' WHERE timezone IS NULL AND code = 'CO';
UPDATE states SET timezone = 'America/New_York' WHERE timezone IS NULL AND code IN ('FL', 'MA', 'MD', 'NJ', 'NY', 'OH', 'PA');
UPDATE states SET timezone = 'America/Chicago' WHERE timezone IS NULL AND code IN ('IL', 'MO', 'OK');
UPDATE states SET timezone = 'America/Detroit' WHERE timezone IS NULL AND code = 'MI';

-- Set default is_active for existing rows
UPDATE states SET is_active = TRUE WHERE is_active IS NULL;
UPDATE states SET crawl_enabled = TRUE WHERE crawl_enabled IS NULL;

-- Insert known states (idempotent - ON CONFLICT DO UPDATE to fill missing values)
INSERT INTO states (code, name, timezone, is_active, crawl_enabled) VALUES
    ('AZ', 'Arizona', 'America/Phoenix', TRUE, TRUE),
    ('CA', 'California', 'America/Los_Angeles', TRUE, TRUE),
    ('CO', 'Colorado', 'America/Denver', TRUE, TRUE),
    ('FL', 'Florida', 'America/New_York', TRUE, TRUE),
    ('IL', 'Illinois', 'America/Chicago', TRUE, TRUE),
    ('MA', 'Massachusetts', 'America/New_York', TRUE, TRUE),
    ('MD', 'Maryland', 'America/New_York', TRUE, TRUE),
    ('MI', 'Michigan', 'America/Detroit', TRUE, TRUE),
    ('MO', 'Missouri', 'America/Chicago', TRUE, TRUE),
    ('NV', 'Nevada', 'America/Los_Angeles', TRUE, TRUE),
    ('NJ', 'New Jersey', 'America/New_York', TRUE, TRUE),
    ('NY', 'New York', 'America/New_York', TRUE, TRUE),
    ('OH', 'Ohio', 'America/New_York', TRUE, TRUE),
    ('OK', 'Oklahoma', 'America/Chicago', TRUE, TRUE),
    ('OR', 'Oregon', 'America/Los_Angeles', TRUE, TRUE),
    ('PA', 'Pennsylvania', 'America/New_York', TRUE, TRUE),
    ('WA', 'Washington', 'America/Los_Angeles', TRUE, TRUE)
ON CONFLICT (code) DO UPDATE SET
    timezone = COALESCE(states.timezone, EXCLUDED.timezone),
    is_active = COALESCE(states.is_active, EXCLUDED.is_active),
    crawl_enabled = COALESCE(states.crawl_enabled, EXCLUDED.crawl_enabled),
    updated_at = NOW();

CREATE INDEX IF NOT EXISTS idx_states_code ON states(code);
CREATE INDEX IF NOT EXISTS idx_states_active ON states(is_active) WHERE is_active = TRUE;

COMMENT ON TABLE states IS 'US states where CannaiQ operates. Single source of truth for state configuration.';


-- ============================================================================
-- SECTION 2: CHAINS TABLE
-- ============================================================================
-- Retail chains/groups that own multiple dispensary locations.
-- Examples: Curaleaf, Trulieve, Harvest, Columbia Care

CREATE TABLE IF NOT EXISTS chains (
    id SERIAL PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    slug VARCHAR(255) NOT NULL,
    website_url TEXT,
    logo_url TEXT,
    description TEXT,
    headquarters_city VARCHAR(100),
    headquarters_state_id INTEGER,
    founded_year INTEGER,
    is_active BOOLEAN DEFAULT TRUE,
    is_public BOOLEAN DEFAULT FALSE,
    stock_ticker VARCHAR(10),
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW()
);

-- Add unique constraint on slug if not exists
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'chains_slug_key' AND conrelid = 'chains'::regclass
    ) THEN
        ALTER TABLE chains ADD CONSTRAINT chains_slug_key UNIQUE (slug);
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

-- Add FK to states if not exists
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'chains_headquarters_state_id_fkey'
    ) THEN
        ALTER TABLE chains
        ADD CONSTRAINT chains_headquarters_state_id_fkey
        FOREIGN KEY (headquarters_state_id) REFERENCES states(id) ON DELETE SET NULL;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

CREATE INDEX IF NOT EXISTS idx_chains_slug ON chains(slug);
CREATE INDEX IF NOT EXISTS idx_chains_active ON chains(is_active) WHERE is_active = TRUE;

COMMENT ON TABLE chains IS 'Retail chains/groups that own multiple dispensary locations.';


-- ============================================================================
-- SECTION 3: ADD state_id AND chain_id TO DISPENSARIES
-- ============================================================================
-- Link existing dispensaries table to states and chains.

ALTER TABLE dispensaries ADD COLUMN IF NOT EXISTS state_id INTEGER;
ALTER TABLE dispensaries ADD COLUMN IF NOT EXISTS chain_id INTEGER;

-- Add FK constraints if not exist
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'dispensaries_state_id_fkey'
    ) THEN
        ALTER TABLE dispensaries
        ADD CONSTRAINT dispensaries_state_id_fkey
        FOREIGN KEY (state_id) REFERENCES states(id) ON DELETE SET NULL;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'dispensaries_chain_id_fkey'
    ) THEN
        ALTER TABLE dispensaries
        ADD CONSTRAINT dispensaries_chain_id_fkey
        FOREIGN KEY (chain_id) REFERENCES chains(id) ON DELETE SET NULL;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

CREATE INDEX IF NOT EXISTS idx_dispensaries_state_id ON dispensaries(state_id);
CREATE INDEX IF NOT EXISTS idx_dispensaries_chain_id ON dispensaries(chain_id) WHERE chain_id IS NOT NULL;

-- Backfill state_id from existing state column (safe - only updates NULL values)
UPDATE dispensaries d
SET state_id = s.id
FROM states s
WHERE d.state = s.code
  AND d.state_id IS NULL;

COMMENT ON COLUMN dispensaries.state_id IS 'FK to states table. Canonical state reference.';
COMMENT ON COLUMN dispensaries.chain_id IS 'FK to chains table. NULL if independent dispensary.';


-- ============================================================================
-- SECTION 4: CRAWL_RUNS TABLE
-- ============================================================================
-- One record per crawl execution. Links to snapshots.

CREATE TABLE IF NOT EXISTS crawl_runs (
    id SERIAL PRIMARY KEY,
    dispensary_id INTEGER NOT NULL,
    state_id INTEGER,

    -- Provider info
    provider VARCHAR(50) NOT NULL DEFAULT 'dutchie',

    -- Timing
    started_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    finished_at TIMESTAMPTZ,
    duration_ms INTEGER,

    -- Status
    status VARCHAR(20) NOT NULL DEFAULT 'running',
    error_code VARCHAR(50),
    error_message TEXT,
    http_status INTEGER,

    -- Results
    products_found INTEGER DEFAULT 0,
    products_new INTEGER DEFAULT 0,
    products_updated INTEGER DEFAULT 0,
    products_missing INTEGER DEFAULT 0,
    snapshots_written INTEGER DEFAULT 0,

    -- Infrastructure
    worker_id VARCHAR(100),
    worker_hostname VARCHAR(100),
    proxy_used TEXT,
    trigger_type VARCHAR(50) DEFAULT 'scheduled',

    -- Metadata
    metadata JSONB DEFAULT '{}',

    created_at TIMESTAMPTZ DEFAULT NOW()
);

-- Add FK constraints if not exist
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'crawl_runs_dispensary_id_fkey'
    ) THEN
        ALTER TABLE crawl_runs
        ADD CONSTRAINT crawl_runs_dispensary_id_fkey
        FOREIGN KEY (dispensary_id) REFERENCES dispensaries(id) ON DELETE CASCADE;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'crawl_runs_state_id_fkey'
    ) THEN
        ALTER TABLE crawl_runs
        ADD CONSTRAINT crawl_runs_state_id_fkey
        FOREIGN KEY (state_id) REFERENCES states(id) ON DELETE SET NULL;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

CREATE INDEX IF NOT EXISTS idx_crawl_runs_dispensary ON crawl_runs(dispensary_id);
CREATE INDEX IF NOT EXISTS idx_crawl_runs_state ON crawl_runs(state_id) WHERE state_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_crawl_runs_status ON crawl_runs(status);
CREATE INDEX IF NOT EXISTS idx_crawl_runs_started ON crawl_runs(started_at DESC);
CREATE INDEX IF NOT EXISTS idx_crawl_runs_dispensary_started ON crawl_runs(dispensary_id, started_at DESC);

COMMENT ON TABLE crawl_runs IS 'Each crawl execution. Links to snapshots and traces.';


-- ============================================================================
-- SECTION 5: STORE_PRODUCTS TABLE
-- ============================================================================
-- Current state of products on each dispensary menu.
-- Provider-agnostic structure for analytics.

CREATE TABLE IF NOT EXISTS store_products (
    id SERIAL PRIMARY KEY,
    dispensary_id INTEGER NOT NULL,
    state_id INTEGER,

    -- Provider-specific identifiers
    provider VARCHAR(50) NOT NULL DEFAULT 'dutchie',
    provider_product_id VARCHAR(100) NOT NULL,
    provider_brand_id VARCHAR(100),
    enterprise_product_id VARCHAR(100),

    -- Raw data from platform (not normalized)
    name VARCHAR(500) NOT NULL,
    brand_name VARCHAR(255),
    category VARCHAR(100),
    subcategory VARCHAR(100),
    strain_type VARCHAR(50),
    description TEXT,

    -- Pricing (current)
    price_rec NUMERIC(10,2),
    price_med NUMERIC(10,2),
    price_rec_special NUMERIC(10,2),
    price_med_special NUMERIC(10,2),
    is_on_special BOOLEAN DEFAULT FALSE,
    special_name TEXT,
    discount_percent NUMERIC(5,2),
    price_unit VARCHAR(20) DEFAULT 'each',

    -- Inventory
    is_in_stock BOOLEAN DEFAULT TRUE,
    stock_quantity INTEGER,
    stock_status VARCHAR(50) DEFAULT 'in_stock',

    -- Potency
    thc_percent NUMERIC(5,2),
    cbd_percent NUMERIC(5,2),
    thc_mg NUMERIC(10,2),
    cbd_mg NUMERIC(10,2),

    -- Weight/Size
    weight_value NUMERIC(10,2),
    weight_unit VARCHAR(20),

    -- Images
    image_url TEXT,
    local_image_path TEXT,
    thumbnail_url TEXT,

    -- Flags
    is_featured BOOLEAN DEFAULT FALSE,
    medical_only BOOLEAN DEFAULT FALSE,
    rec_only BOOLEAN DEFAULT FALSE,

    -- Menu position (for tracking prominence)
    menu_position INTEGER,

    -- Timestamps
    first_seen_at TIMESTAMPTZ DEFAULT NOW(),
    last_seen_at TIMESTAMPTZ DEFAULT NOW(),
    last_price_change_at TIMESTAMPTZ,
    last_stock_change_at TIMESTAMPTZ,

    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW()
);

-- Add unique constraint if not exists
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'store_products_dispensary_provider_product_key'
    ) THEN
        ALTER TABLE store_products
        ADD CONSTRAINT store_products_dispensary_provider_product_key
        UNIQUE (dispensary_id, provider, provider_product_id);
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

-- Add FK constraints if not exist
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'store_products_dispensary_id_fkey'
    ) THEN
        ALTER TABLE store_products
        ADD CONSTRAINT store_products_dispensary_id_fkey
        FOREIGN KEY (dispensary_id) REFERENCES dispensaries(id) ON DELETE CASCADE;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'store_products_state_id_fkey'
    ) THEN
        ALTER TABLE store_products
        ADD CONSTRAINT store_products_state_id_fkey
        FOREIGN KEY (state_id) REFERENCES states(id) ON DELETE SET NULL;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

CREATE INDEX IF NOT EXISTS idx_store_products_dispensary ON store_products(dispensary_id);
CREATE INDEX IF NOT EXISTS idx_store_products_state ON store_products(state_id) WHERE state_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_store_products_category ON store_products(category) WHERE category IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_store_products_brand_name ON store_products(brand_name) WHERE brand_name IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_store_products_in_stock ON store_products(dispensary_id, is_in_stock);
CREATE INDEX IF NOT EXISTS idx_store_products_special ON store_products(dispensary_id, is_on_special) WHERE is_on_special = TRUE;
CREATE INDEX IF NOT EXISTS idx_store_products_last_seen ON store_products(last_seen_at DESC);
CREATE INDEX IF NOT EXISTS idx_store_products_provider ON store_products(provider);
CREATE INDEX IF NOT EXISTS idx_store_products_enterprise ON store_products(enterprise_product_id) WHERE enterprise_product_id IS NOT NULL;

COMMENT ON TABLE store_products IS 'Current state of products on each dispensary menu. Provider-agnostic.';


-- ============================================================================
-- SECTION 6: STORE_PRODUCT_SNAPSHOTS TABLE
-- ============================================================================
-- Historical price/stock data. One row per product per crawl.
-- CRITICAL: NEVER DELETE from this table.

CREATE TABLE IF NOT EXISTS store_product_snapshots (
    id SERIAL PRIMARY KEY,
    dispensary_id INTEGER NOT NULL,
    store_product_id INTEGER,
    state_id INTEGER,

    -- Provider info
    provider VARCHAR(50) NOT NULL DEFAULT 'dutchie',
    provider_product_id VARCHAR(100),

    -- Link to crawl run
    crawl_run_id INTEGER,

    -- Capture timestamp
    captured_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    -- Raw data from platform
    name VARCHAR(500),
    brand_name VARCHAR(255),
    category VARCHAR(100),
    subcategory VARCHAR(100),

    -- Pricing at time of capture
    price_rec NUMERIC(10,2),
    price_med NUMERIC(10,2),
    price_rec_special NUMERIC(10,2),
    price_med_special NUMERIC(10,2),
    is_on_special BOOLEAN DEFAULT FALSE,
    discount_percent NUMERIC(5,2),

    -- Inventory at time of capture
    is_in_stock BOOLEAN DEFAULT TRUE,
    stock_quantity INTEGER,
    stock_status VARCHAR(50) DEFAULT 'in_stock',
    is_present_in_feed BOOLEAN DEFAULT TRUE,

    -- Potency at time of capture
    thc_percent NUMERIC(5,2),
    cbd_percent NUMERIC(5,2),

    -- Menu position (for tracking prominence changes)
    menu_position INTEGER,

    -- Image URL at time of capture
    image_url TEXT,

    -- Full raw response for debugging
    raw_data JSONB,

    created_at TIMESTAMPTZ DEFAULT NOW()
);

-- Add FK constraints if not exist
DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'store_product_snapshots_dispensary_id_fkey'
    ) THEN
        ALTER TABLE store_product_snapshots
        ADD CONSTRAINT store_product_snapshots_dispensary_id_fkey
        FOREIGN KEY (dispensary_id) REFERENCES dispensaries(id) ON DELETE CASCADE;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'store_product_snapshots_store_product_id_fkey'
    ) THEN
        ALTER TABLE store_product_snapshots
        ADD CONSTRAINT store_product_snapshots_store_product_id_fkey
        FOREIGN KEY (store_product_id) REFERENCES store_products(id) ON DELETE SET NULL;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'store_product_snapshots_state_id_fkey'
    ) THEN
        ALTER TABLE store_product_snapshots
        ADD CONSTRAINT store_product_snapshots_state_id_fkey
        FOREIGN KEY (state_id) REFERENCES states(id) ON DELETE SET NULL;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conname = 'store_product_snapshots_crawl_run_id_fkey'
    ) THEN
        ALTER TABLE store_product_snapshots
        ADD CONSTRAINT store_product_snapshots_crawl_run_id_fkey
        FOREIGN KEY (crawl_run_id) REFERENCES crawl_runs(id) ON DELETE SET NULL;
    END IF;
EXCEPTION
    WHEN duplicate_object THEN
        NULL;
    WHEN OTHERS THEN
        NULL;
END $$;

-- Indexes optimized for analytics queries
CREATE INDEX IF NOT EXISTS idx_snapshots_dispensary_captured ON store_product_snapshots(dispensary_id, captured_at DESC);
CREATE INDEX IF NOT EXISTS idx_snapshots_state_captured ON store_product_snapshots(state_id, captured_at DESC) WHERE state_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_snapshots_product_captured ON store_product_snapshots(store_product_id, captured_at DESC) WHERE store_product_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_snapshots_crawl_run ON store_product_snapshots(crawl_run_id) WHERE crawl_run_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_snapshots_captured_at ON store_product_snapshots(captured_at DESC);
CREATE INDEX IF NOT EXISTS idx_snapshots_brand ON store_product_snapshots(brand_name) WHERE brand_name IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_snapshots_provider_product ON store_product_snapshots(provider_product_id) WHERE provider_product_id IS NOT NULL;

COMMENT ON TABLE store_product_snapshots IS 'Historical crawl data. One row per product per crawl. NEVER DELETE.';


-- ============================================================================
-- SECTION 7: VIEWS FOR BACKWARD COMPATIBILITY
-- ============================================================================

-- View: Latest snapshot per store product
CREATE OR REPLACE VIEW v_latest_store_snapshots AS
SELECT DISTINCT ON (dispensary_id, provider_product_id)
    sps.*
FROM store_product_snapshots sps
ORDER BY dispensary_id, provider_product_id, captured_at DESC;

-- View: Crawl run summary per dispensary
CREATE OR REPLACE VIEW v_dispensary_crawl_summary AS
SELECT
    d.id AS dispensary_id,
    COALESCE(d.dba_name, d.name) AS dispensary_name,
    d.city,
    d.state,
    d.state_id,
    s.name AS state_name,
    COUNT(DISTINCT sp.id) AS current_product_count,
    COUNT(DISTINCT sp.id) FILTER (WHERE sp.is_in_stock) AS in_stock_count,
    COUNT(DISTINCT sp.id) FILTER (WHERE sp.is_on_special) AS on_special_count,
    MAX(cr.finished_at) AS last_crawl_at,
    (SELECT status FROM crawl_runs WHERE dispensary_id = d.id ORDER BY started_at DESC LIMIT 1) AS last_crawl_status
FROM dispensaries d
LEFT JOIN states s ON s.id = d.state_id
LEFT JOIN store_products sp ON sp.dispensary_id = d.id
LEFT JOIN crawl_runs cr ON cr.dispensary_id = d.id
GROUP BY d.id, d.dba_name, d.name, d.city, d.state, d.state_id, s.name;


-- ============================================================================
-- MIGRATION 051 COMPLETE
-- ============================================================================

SELECT 'Migration 051 completed successfully. Canonical schema is ready.' AS status;