postgresql-9.5-mimeo 1.4.1-1 / usr / share / postgresql / 9.5 / extension / mimeo--0.1.0--0.2.0.sql

-- Renamed refresh_incremental to refresh_inserter
-- Fixed bug in refresh_inserter that would cause duped inserts and/or missing data
-- Added refresh_updater
-- Added type column to config table. Allows easier automation (Ex: cronjob to run all snaps)

-- NOTE: After update of this table, set the type for all current jobs and then set column to NOT NULL
CREATE TYPE refresh_type AS ENUM ('snap', 'inserter', 'updater', 'dml', 'logdel');
ALTER TABLE @extschema@.refresh_config ADD COLUMN type refresh_type;
CREATE INDEX refresh_config_type_idx ON refresh_config (type);

DROP FUNCTION @extschema@.refresh_incremental(text, boolean, int);

CREATE FUNCTION refresh_inserter(p_destination text, p_debug boolean, int default 100000) RETURNS void
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
declare
v_job_name       text;
v_job_id         int;
v_step_id        int;
v_rowcount       bigint; 
v_dblink_schema     text;
v_jobmon_schema     text;
v_old_search_path   text;

v_source_table   text;
v_dest_table     text;
v_tmp_table      text;
v_dblink         text;
v_control  text;
v_last_value     timestamptz;
v_boundary        timestamptz;
v_filter         text[]; 
v_cols           text;
v_cols_n_types   text;

v_remote_sql     text;
v_insert_sql     text;
v_create_sql     text;
v_delete_sql     text;

BEGIN

IF p_debug IS DISTINCT FROM true THEN
    PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;

v_job_name := 'Refresh Inserter: '||p_destination;

PERFORM pg_advisory_lock(hashtext('refresh_inserter'), hashtext(v_job_name));

SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;

-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';

v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);

v_step_id := add_step(v_job_id,'Grabbing Boundries, Building SQL');

SELECT source_table, dest_table, 'tmp_'||replace(dest_table,'.','_'), dblink, control, last_value, now() - boundary::interval, filter FROM refresh_config WHERE dest_table = p_destination INTO v_source_table, v_dest_table, v_tmp_table, v_dblink, v_control, v_last_value, v_boundary, v_filter; 
IF NOT FOUND THEN
   RAISE EXCEPTION 'ERROR: no mapping found for %',v_job_name; 
END IF;  

IF v_filter IS NULL THEN 
    SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||atttypid::regtype::text),',') FROM 
    pg_attribute WHERE attnum > 0 AND attisdropped is false AND attrelid = p_destination::regclass INTO v_cols, v_cols_n_types;
ELSE
    SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||atttypid::regtype::text),',') FROM 
        (SELECT unnest(filter) FROM @extschema@.refresh_config WHERE dest_table = p_destination) x 
         JOIN pg_attribute ON (unnest=attname::text AND attrelid=p_destination::regclass) INTO v_cols, v_cols_n_types;
END IF;    

-- init sql statements 

-- does >= and < to keep missing data from happening on rare edge case where a newly inserted row outside the transaction batch
-- has the exact same timestamp as the previous batch's max timestamp
-- Note that this means the destination table is always at least one row behind even when no new data is entered on the source.
v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table||' WHERE '||v_control||' >= '||quote_literal(v_last_value)||' AND '||v_control||' < '||quote_literal(v_boundary)||' LIMIT '|| $3;

v_create_sql := 'CREATE TEMP TABLE '||v_tmp_table||' AS SELECT '||v_cols||' FROM dblink(auth('||v_dblink||'),'||quote_literal(v_remote_sql)||') t ('||v_cols_n_types||')';

v_insert_sql := 'INSERT INTO '||v_dest_table||'('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table; 

PERFORM update_step(v_step_id, 'OK','Grabbing rows from '||v_last_value::text||' to '||v_boundary::text);

-- create temp from remote
v_step_id := add_step(v_job_id,'Creating temp table ('||v_tmp_table||') from remote table');
    PERFORM gdb(p_debug,v_create_sql);
    EXECUTE v_create_sql; 
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
    PERFORM update_step(v_step_id, 'OK','Table contains '||v_rowcount||' records');
    PERFORM gdb(p_debug, v_rowcount || ' rows added to temp table');

-- insert
v_step_id := add_step(v_job_id,'Inserting new records into local table');
    PERFORM gdb(p_debug,v_insert_sql);
    EXECUTE v_insert_sql; 
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
    PERFORM update_step(v_step_id, 'OK','Inserted '||v_rowcount||' records');
    PERFORM gdb(p_debug, v_rowcount || ' rows added to ' || v_dest_table);

-- update boundries
v_step_id := add_step(v_job_id,'Updating boundary values');
UPDATE refresh_config set last_value = v_boundary WHERE dest_table = p_destination;  

PERFORM update_step(v_step_id, 'OK','Done');

PERFORM close_job(v_job_id);

EXECUTE 'DROP TABLE IF EXISTS ' || v_tmp_table;

-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';

PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));

EXCEPTION
    WHEN OTHERS THEN
        EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';
        PERFORM update_step(v_step_id, 'BAD', 'ERROR: '||coalesce(SQLERRM,'unknown'));
        PERFORM fail_job(v_job_id);

        -- Ensure old search path is reset for the current session
        EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';

        PERFORM pg_advisory_unlock(hashtext('refresh_inserter'), hashtext(v_job_name));
        RAISE EXCEPTION '%', SQLERRM;    
END
$$;


CREATE FUNCTION refresh_updater(p_destination text, p_debug boolean, integer DEFAULT 100000) RETURNS void
    LANGUAGE plpgsql SECURITY DEFINER
    AS $_$
declare
v_job_name          text;
v_job_id            int;
v_step_id           int;
v_rowcount          bigint; 
v_dblink_schema     text;
v_jobmon_schema     text;
v_old_search_path   text;

v_source_table      text;
v_dest_table        text;
v_tmp_table         text;
v_dblink            text;
v_control           text;
v_last_value_sql    text; 
v_last_value        timestamptz; 
v_boundry           timestamptz;
v_remote_boundry      timestamptz;
v_pk_field          text[];
v_pk_type           text[];
v_pk_counter        int := 2;
v_pk_field_csv      text;
v_with_update       text;
v_field             text;
v_filter            text[];
v_cols              text;
v_cols_n_types      text;
v_pk_where          text;

v_trigger_update    text;
v_trigger_delete    text; 
v_exec_status       text;

v_remote_sql      text;
v_remote_f_sql      text;
v_insert_sql        text;
v_create_sql      text;
v_create_f_sql      text;
v_delete_sql        text;
v_boundry_sql       text;
v_remote_boundry_sql        text;

BEGIN

IF p_debug IS DISTINCT FROM true THEN
    PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;

v_job_name := 'Refresh Updater: '||p_destination;

PERFORM pg_advisory_lock(hashtext('refresh_updaters'), hashtext(v_job_name));

SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;

-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';


v_job_id := add_job(v_job_name);
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);

-- grab boundry
v_step_id := add_step(v_job_id,'Grabbing Boundries, Building SQL');

SELECT source_table, dest_table, 'tmp_'||replace(dest_table,'.','_'), dblink, control, last_value, now() - boundary::interval, pk_field, pk_type, filter FROM refresh_config
WHERE dest_table = p_destination INTO v_source_table, v_dest_table, v_tmp_table, v_dblink, v_control, v_last_value, v_boundry, v_pk_field, v_pk_type, v_filter;
IF NOT FOUND THEN
   RAISE EXCEPTION 'ERROR: no mapping found for %',v_job_name;
END IF;

-- determine column list, column type list
IF v_filter IS NULL THEN 
    SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||atttypid::regtype::text),',') FROM 
        pg_attribute WHERE attnum > 0 AND attisdropped is false AND attrelid = p_destination::regclass INTO v_cols, v_cols_n_types;
ELSE
    -- ensure all primary key columns are included in any column filters
    FOREACH v_field IN ARRAY v_pk_field LOOP
        IF v_field = ANY(v_filter) THEN
            CONTINUE;
        ELSE
            RAISE EXCEPTION 'ERROR: filter list did not contain all columns that compose primary key for %',v_job_name; 
        END IF;
    END LOOP;
    SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||atttypid::regtype::text),',') FROM 
        (SELECT unnest(filter) FROM refresh_config WHERE dest_table = p_destination) x 
         JOIN pg_attribute ON (unnest=attname::text AND attrelid=p_destination::regclass) INTO v_cols, v_cols_n_types;
END IF;    

PERFORM update_step(v_step_id, 'OK','Initial boundary from '||v_last_value::text||' to '||v_boundry::text);

-- Find boundary that will limit to ~ 50k rows 

v_remote_boundry_sql := 'SELECT max(' || v_control || ') as i FROM (SELECT * FROM '||v_source_table||' WHERE '||v_control||' > '||quote_literal(v_last_value)||' AND '||v_control||' <= '||quote_literal(v_boundry) || ' ORDER BY '||v_control||' ASC LIMIT '|| $3 ||' ) as x';

v_boundry_sql := 'SELECT i FROM dblink(auth('||v_dblink||'),'||quote_literal(v_remote_boundry_sql)||') t (i timestamptz)';

SELECT add_step(v_job_id,'Getting real boundary') INTO v_step_id;
    perform gdb(p_debug,v_boundry_sql);
    execute v_boundry_sql INTO v_remote_boundry;

PERFORM update_step(v_step_id, 'OK','Real boundary: ' || coalesce( v_remote_boundry, v_boundry ) || ' ' || ( v_boundry - coalesce( v_remote_boundry, v_boundry ) ) );

    v_boundry := coalesce( v_remote_boundry, v_boundry );

-- init sql statements 

v_remote_sql := 'SELECT '||v_cols||' FROM '||v_source_table||' WHERE '||v_control||' > '||quote_literal(v_last_value)||' AND '||v_control||' <= '||quote_literal(v_boundry);

v_create_sql := 'CREATE TEMP TABLE '||v_tmp_table||' AS SELECT '||v_cols||' FROM dblink(auth('||v_dblink||'),'||quote_literal(v_remote_sql)||') t ('||v_cols_n_types||')';

v_delete_sql := 'DELETE FROM '||v_dest_table||' USING '||v_tmp_table||' t WHERE '||v_dest_table||'.'||v_pk_field[1]||'=t.'||v_pk_field[1]; 

v_insert_sql := 'INSERT INTO '||v_dest_table||'('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table; 

-- create temp from remote
SELECT add_step(v_job_id,'Creating temp table ('||v_tmp_table||') from remote table') INTO v_step_id;
    perform gdb(p_debug,v_create_sql);
    execute v_create_sql;     
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK','Table contains '||v_rowcount||' records');

-- delete (update)
SELECT add_step(v_job_id,'Updating records in local table') INTO v_step_id;
    perform gdb(p_debug,v_delete_sql);
    execute v_delete_sql; 
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK','Updated '||v_rowcount||' records');

-- insert
SELECT add_step(v_job_id,'Inserting new records into local table') INTO v_step_id;
    perform gdb(p_debug,v_insert_sql);
    execute v_insert_sql; 
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
PERFORM update_step(v_step_id, 'OK','Inserted '||v_rowcount||' records');

-- update activity status
v_step_id := add_step(v_job_id,'Updating last_value in config table');
    v_last_value_sql := 'UPDATE refresh_config SET last_value = '|| quote_literal(v_boundry) ||' WHERE dest_table = ' ||quote_literal(p_destination); 
    PERFORM gdb(p_debug,v_last_value_sql);
    EXECUTE v_last_value_sql; 
PERFORM update_step(v_step_id, 'OK','Last Value was '||quote_literal(v_boundry));

EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table;

PERFORM close_job(v_job_id);

-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';

PERFORM pg_advisory_unlock(hashtext('refresh_updaters'), hashtext(v_job_name));

EXCEPTION
    WHEN others THEN
        -- Exception block resets path, so have to reset it again
        EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';
        PERFORM update_step(v_step_id, 'BAD', 'ERROR: '||coalesce(SQLERRM,'unknown'));
        PERFORM fail_job(v_job_id);

        -- Ensure old search path is reset for the current session
       EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';

        PERFORM pg_advisory_unlock(hashtext('refresh_updaters'), hashtext(v_job_name));
        RAISE EXCEPTION '%', SQLERRM;
END
$_$;


CREATE OR REPLACE FUNCTION refresh_dml(p_destination text, p_debug boolean, int default 100000) RETURNS void
    LANGUAGE plpgsql SECURITY DEFINER
    AS $$
declare
v_job_name          text;
v_job_id            int;
v_step_id           int;
v_rowcount          bigint; 
v_dblink_schema     text;
v_jobmon_schema     text;
v_old_search_path   text;

v_source_table      text;
v_dest_table        text;
v_tmp_table         text;
v_dblink            text;
v_control           text;
v_last_value_sql    text; 
v_boundry           timestamptz;
v_pk_field          text[];
v_pk_type           text[];
v_pk_counter        int := 2;
v_pk_field_csv      text;
v_with_update       text;
v_field             text;
v_filter            text[];
v_cols              text;
v_cols_n_types      text;
v_pk_where          text;

v_trigger_update    text;
v_trigger_delete    text; 
v_exec_status       text;

v_remote_q_sql      text;
v_remote_f_sql      text;
v_insert_sql        text;
v_create_q_sql      text;
v_create_f_sql      text;
v_delete_sql        text;

BEGIN

IF p_debug IS DISTINCT FROM true THEN
    PERFORM set_config( 'client_min_messages', 'warning', true );
END IF;

v_job_name := 'Refresh DML: '||p_destination;

PERFORM pg_advisory_lock(hashtext('refresh_dml'), hashtext(v_job_name));

SELECT nspname INTO v_dblink_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'dblink' AND e.extnamespace = n.oid;
SELECT nspname INTO v_jobmon_schema FROM pg_namespace n, pg_extension e WHERE e.extname = 'pg_jobmon' AND e.extnamespace = n.oid;

-- Set custom search path to allow easier calls to other functions, especially job logging
SELECT current_setting('search_path') INTO v_old_search_path;
EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';

SELECT source_table, dest_table, 'tmp_'||replace(dest_table,'.','_'), dblink, control, pk_field, pk_type, filter FROM refresh_config 
WHERE dest_table = p_destination INTO v_source_table, v_dest_table, v_tmp_table, v_dblink, v_control, v_pk_field, v_pk_type, v_filter; 
IF NOT FOUND THEN
   RAISE EXCEPTION 'ERROR: no mapping found for %',v_job_name; 
END IF;

v_job_id := add_job(quote_literal(v_job_name));
PERFORM gdb(p_debug,'Job ID: '||v_job_id::text);

v_step_id := add_step(v_job_id,'Grabbing Boundries, Building SQL');

IF v_pk_field IS NULL OR v_pk_type IS NULL THEN
    RAISE EXCEPTION 'ERROR: primary key fields in refresh_config must be defined';
END IF;

-- determine column list, column type list
IF v_filter IS NULL THEN 
    SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||atttypid::regtype::text),',') FROM 
        pg_attribute WHERE attnum > 0 AND attisdropped is false AND attrelid = p_destination::regclass INTO v_cols, v_cols_n_types;
ELSE
    -- ensure all primary key columns are included in any column filters
    FOREACH v_field IN ARRAY v_pk_field LOOP
        IF v_field = ANY(v_filter) THEN
            CONTINUE;
        ELSE
            RAISE EXCEPTION 'ERROR: filter list did not contain all columns that compose primary key for %',v_job_name; 
        END IF;
    END LOOP;
    SELECT array_to_string(array_agg(attname),','), array_to_string(array_agg(attname||' '||atttypid::regtype::text),',') FROM 
        (SELECT unnest(filter) FROM refresh_config WHERE dest_table = p_destination) x 
         JOIN pg_attribute ON (unnest=attname::text AND attrelid=p_destination::regclass) INTO v_cols, v_cols_n_types;
END IF;    

-- init sql statements 

v_pk_field_csv := array_to_string(v_pk_field,',');
v_with_update := 'WITH a AS (SELECT '||v_pk_field_csv||' FROM '|| v_control ||' ORDER BY 1 LIMIT '|| $3 ||') UPDATE '||v_control||' b SET processed = true FROM a WHERE a.'||v_pk_field[1]||' = b.'||v_pk_field[1];

IF array_length(v_pk_field, 1) > 1 THEN
    v_pk_where := '';
    WHILE v_pk_counter <= array_length(v_pk_field,1) LOOP
        v_pk_where := v_pk_where || ' AND a.'||v_pk_field[v_pk_counter]||' = b.'||v_pk_field[v_pk_counter];
        v_pk_counter := v_pk_counter + 1;
    END LOOP;
END IF;

IF v_pk_where IS NOT NULL THEN
    v_with_update := v_with_update || v_pk_where;
END IF;
PERFORM gdb(p_debug, v_with_update);

v_trigger_update := 'SELECT dblink_exec(auth('||v_dblink||'),'|| quote_literal(v_with_update)||')';

v_remote_q_sql := 'SELECT DISTINCT '||v_pk_field_csv||' FROM '||v_control||' WHERE processed = true';

v_remote_f_sql := 'SELECT '||v_cols||' FROM '||v_source_table||' JOIN ('||v_remote_q_sql||') x USING ('||v_pk_field_csv||')';
v_create_f_sql := 'CREATE TEMP TABLE '||v_tmp_table||'_full AS SELECT '||v_cols||' 
    FROM dblink(auth('||v_dblink||'),'||quote_literal(v_remote_f_sql)||') t ('||v_cols_n_types||')';

v_delete_sql := 'DELETE FROM '||v_dest_table||' a USING '||v_tmp_table||'_full b WHERE a.'||v_pk_field[1]||'= b.'||v_pk_field[1];
IF array_length(v_pk_field, 1) > 1 THEN
    v_delete_sql := v_delete_sql || v_pk_where;
END IF; 

v_insert_sql := 'INSERT INTO '||v_dest_table||'('||v_cols||') SELECT '||v_cols||' FROM '||v_tmp_table||'_full'; 

v_trigger_delete := 'SELECT dblink_exec(auth('||v_dblink||'),'||quote_literal('DELETE FROM '||v_control||' WHERE processed = true')||')'; 

PERFORM update_step(v_step_id, 'OK','Remote table is '||v_source_table);

-- update remote entries
v_step_id := add_step(v_job_id,'Updating remote trigger table');
    PERFORM gdb(p_debug,v_trigger_update);
    EXECUTE v_trigger_update INTO v_exec_status;    
PERFORM update_step(v_step_id, 'OK','Result was '||v_exec_status);

-- create temp table for insertion 
v_step_id := add_step(v_job_id,'Create temp table from remote full table');
    PERFORM gdb(p_debug,v_create_f_sql);
    EXECUTE v_create_f_sql;  
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
    PERFORM gdb(p_debug,'Temp table row count '||v_rowcount::text);
PERFORM update_step(v_step_id, 'OK','Table contains '||v_rowcount||' records');

-- remove records from local table 
v_step_id := add_step(v_job_id,'Deleting records from local table');
    PERFORM gdb(p_debug,v_delete_sql);
    EXECUTE v_delete_sql; 
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
    PERFORM gdb(p_debug,'Rows removed from local table before applying changes: '||v_rowcount::text);
PERFORM update_step(v_step_id, 'OK','Removed '||v_rowcount||' records');

-- insert records to local table
v_step_id := add_step(v_job_id,'Inserting new records into local table');
    PERFORM gdb(p_debug,v_insert_sql);
    EXECUTE v_insert_sql;
    GET DIAGNOSTICS v_rowcount = ROW_COUNT;
    PERFORM gdb(p_debug,'Rows inserted: '||v_rowcount::text);
PERFORM update_step(v_step_id, 'OK','Inserted '||v_rowcount||' records');

-- clean out rows from txn table
v_step_id := add_step(v_job_id,'Cleaning out rows from txn table');
    PERFORM gdb(p_debug,v_trigger_delete);
    EXECUTE v_trigger_delete INTO v_exec_status;
PERFORM update_step(v_step_id, 'OK','Result was '||v_exec_status);

-- update activity status
v_step_id := add_step(v_job_id,'Updating last_value in config table');
    v_last_value_sql := 'UPDATE refresh_config SET last_value = '|| quote_literal(current_timestamp::timestamp) ||' WHERE dest_table = ' ||quote_literal(p_destination); 
    PERFORM gdb(p_debug,v_last_value_sql);
    EXECUTE v_last_value_sql; 
PERFORM update_step(v_step_id, 'OK','Last Value was '||current_timestamp);

PERFORM close_job(v_job_id);

EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table||'_queue';
EXECUTE 'DROP TABLE IF EXISTS '||v_tmp_table||'_full';

-- Ensure old search path is reset for the current session
EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';

PERFORM pg_advisory_unlock(hashtext('refresh_dml'), hashtext(v_job_name));

EXCEPTION
    WHEN others THEN
        -- Exception block resets path, so have to reset it again
        EXECUTE 'SELECT set_config(''search_path'',''@extschema@,'||v_jobmon_schema||','||v_dblink_schema||''',''false'')';
        PERFORM update_step(v_step_id, 'BAD', 'ERROR: '||coalesce(SQLERRM,'unknown'));
        PERFORM fail_job(v_job_id);

        -- Ensure old search path is reset for the current session
       EXECUTE 'SELECT set_config(''search_path'','''||v_old_search_path||''',''false'')';

        PERFORM pg_advisory_unlock(hashtext('refresh_dml'), hashtext(v_job_name));
        RAISE EXCEPTION '%', SQLERRM;
END
$$;