Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/database/migrations/0008_add_iso_timestamps.up.sql

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+-- Add ISO 8601 compliant timestamp columns to blocks and transactions
+-- This migration adds timestamp_iso columns that store ISO 8601 formatted timestamps
+
+-- Add timestamp_iso column to blocks table
+ALTER TABLE blocks ADD COLUMN IF NOT EXISTS timestamp_iso VARCHAR(30);
+
+-- Create index for timestamp_iso on blocks
+CREATE INDEX IF NOT EXISTS idx_blocks_chain_timestamp_iso ON blocks(chain_id, timestamp_iso);
+
+-- Add timestamp_iso column to transactions table
+-- This will be populated from the block timestamp via trigger
+ALTER TABLE transactions ADD COLUMN IF NOT EXISTS timestamp_iso VARCHAR(30);
+
+-- Create index for timestamp_iso on transactions
+CREATE INDEX IF NOT EXISTS idx_transactions_chain_timestamp_iso ON transactions(chain_id, timestamp_iso);
+
+-- Function to update timestamp_iso from timestamp
+CREATE OR REPLACE FUNCTION update_timestamp_iso()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.timestamp_iso := to_char(NEW.timestamp, 'YYYY-MM-DD"T"HH24:MI:SS"Z"');
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Trigger to automatically update timestamp_iso when timestamp changes in blocks
+DROP TRIGGER IF EXISTS trigger_blocks_timestamp_iso ON blocks;
+CREATE TRIGGER trigger_blocks_timestamp_iso
+    BEFORE INSERT OR UPDATE OF timestamp ON blocks
+    FOR EACH ROW
+    EXECUTE FUNCTION update_timestamp_iso();
+
+-- Function to update transaction timestamp_iso from block timestamp
+CREATE OR REPLACE FUNCTION update_transaction_timestamp_iso()
+RETURNS TRIGGER AS $$
+DECLARE
+    block_timestamp TIMESTAMP;
+BEGIN
+    -- Get the block timestamp
+    SELECT b.timestamp INTO block_timestamp
+    FROM blocks b
+    WHERE b.chain_id = NEW.chain_id AND b.number = NEW.block_number;
+    
+    -- If block timestamp exists, format it as ISO 8601
+    IF block_timestamp IS NOT NULL THEN
+        NEW.timestamp_iso := to_char(block_timestamp, 'YYYY-MM-DD"T"HH24:MI:SS"Z"');
+    END IF;
+    
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Trigger to automatically update timestamp_iso when transaction is inserted/updated
+DROP TRIGGER IF EXISTS trigger_transactions_timestamp_iso ON transactions;
+CREATE TRIGGER trigger_transactions_timestamp_iso
+    BEFORE INSERT OR UPDATE OF block_number ON transactions
+    FOR EACH ROW
+    EXECUTE FUNCTION update_transaction_timestamp_iso();
+
+-- Backfill existing blocks with ISO timestamps
+UPDATE blocks
+SET timestamp_iso = to_char(timestamp, 'YYYY-MM-DD"T"HH24:MI:SS"Z"')
+WHERE timestamp_iso IS NULL;
+
+-- Backfill existing transactions with ISO timestamps from blocks
+UPDATE transactions t
+SET timestamp_iso = to_char(b.timestamp, 'YYYY-MM-DD"T"HH24:MI:SS"Z"')
+FROM blocks b
+WHERE t.chain_id = b.chain_id 
+  AND t.block_number = b.number
+  AND t.timestamp_iso IS NULL;
+