Transform and persist Tend log events

db/migrations/1534193915_add_raw_log_column_to_flip_kick.down.sql

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+ALTER TABLE maker.flip_kick
+  DROP COLUMN raw_log;

db/migrations/1534193915_add_raw_log_column_to_flip_kick.up.sql

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+ALTER TABLE maker.flip_kick
+  ADD COLUMN raw_log json;

db/migrations/1534295712_create_tend_table.down.sql

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+DROP TABLE maker.tend;

db/migrations/1534295712_create_tend_table.up.sql

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+CREATE TABLE maker.tend (
+  db_id            SERIAL PRIMARY KEY,
+  header_id        INTEGER NOT NULL REFERENCES headers (id) ON DELETE CASCADE,
+  id               NUMERIC NOT NULL UNIQUE,
+  lot              NUMERIC,
+  bid              NUMERIC,
+  guy              BYTEA,
+  tic              NUMERIC,
+	era              TIMESTAMP WITH TIME ZONE,
+	tx_idx           INTEGER NOT NUll,
+  raw_log          JSONB
+);